No foothold, no finger hold
The 358 aperture is too small to grip or stand on, so the panel resists climbing without relying on a topping.

358 anti-climb mesh system
Pro Fencing can supply and install 358 prison mesh fencing, a closely spaced, anti-climb perimeter system with clear visibility through the boundary.
Commercial fencing installation across Essex and surrounding areas
System
358 welded mesh, 76.2mm x 12.7mm aperture, 4mm wire
Typical applications
Schools, utilities, plant compounds, sensitive premises
Finish options
Hot-dip galvanised, or galvanised and powder-coated
Access arrangements
Matching mesh pedestrian, swing and sliding gates
Overview
Prison mesh, usually called 358 mesh after its imperial wire spacing, is a welded panel with apertures too small to admit fingers or standard hand tools. That single characteristic is what makes the system effective: there is nothing to grip, nothing to stand on, and cutting through requires bolt croppers working one wire at a time.
It is specified where climbing and cutting are realistic risks: school and academy boundaries, utility and substation compounds, plant and machinery enclosures, waste and recycling sites, communications installations and premises that have been targeted before. Visibility through the mesh stays good, which suits sites relying on supervision or camera coverage.
Prison mesh costs more than twin-wire or V-mesh, so it is worth applying where it earns that cost. On many perimeters the sensible specification uses 358 on the exposed or previously attacked boundaries and a lighter mesh elsewhere. Fixing detail matters as much as the panel: clamp bars or shrouded fittings and deep posts stop panels being levered or unbolted from the attack side.
Because the panels are heavy, rigid and unforgiving of poor setting out, we assess levels, buried services, existing structures and the panel module on site before quoting. That is also where we confirm heights, gate positions and whether a lighter system would serve part of the boundary just as well.
Applications
358 mesh suits boundaries where climbing, cutting or repeat intrusion is a genuine concern rather than a general worry.
Why it works
The 358 aperture is too small to grip or stand on, so the panel resists climbing without relying on a topping.
Heavier wires and welded intersections mean cutting through takes time, noise and dedicated tools.
Despite the tight mesh, visibility through the boundary stays good enough for supervising staff and cameras.
Clamp bars or shrouded fixings and deep post foundations stop panels being unbolted or levered from outside.
Specification
Panel height, post system and fixings are selected against the assessed risk and confirmed following a site survey.
Final specification is confirmed following a site survey.
Our process
We inspect the boundary, access, ground conditions and operational requirements.
We recommend a suitable fencing system, height, finish and gate configuration.
The work is coordinated to minimise disruption and maintain safe site access.
The fencing and gates are installed carefully, checked and left with a clean, consistent finish.
Specification enquiry
Prison mesh is designed for sites requiring a closely spaced, anti-climb perimeter system with excellent visibility through the boundary. Pro Fencing can assess your site requirements and recommend an appropriate mesh configuration, height, finish and gate arrangement.
Why Pro Fencing
We assess how the boundary needs to perform before recommending a fencing system, finish or gate configuration.
Fencing for industrial, educational, commercial and public environments.
Recommendations based on the boundary, ground, access and security requirement.
Installation coordinated to maintain safe access and minimise disruption.
A defined route from site survey and specification through to installation.
Coverage
Pro Fencing supplies and installs commercial fencing systems throughout Essex. We work with businesses, schools, contractors, sports facilities and public-sector organisations, providing site-specific fencing and gate solutions for new installations, upgrades and boundary replacements.
FAQs
The name comes from the panel's imperial wire spacing, roughly 3 inches by 0.5 inches, with 8 gauge wire. In practice it describes a welded mesh with apertures small enough to exclude fingers and most hand tools, which is why it is chosen where climbing and cutting resistance matter more than initial cost.
It is a common specification for exposed school perimeters. The tight mesh cannot be climbed or used as a foothold, while visibility through it supports supervision and looks less severe than palisade. Powder-coated finishes suit education settings, and because the panel resists climbing on its own, toppings are usually unnecessary near pupils.
Palisade is strong and familiar on industrial yards, but its vertical pales offer grip points and it blocks more of the view. Prison mesh resists climbing better and keeps sightlines open for cameras. Palisade can be more resistant to vehicle impact, so the right choice depends on the specific threat rather than a general ranking.
Usually not. The aperture size already makes climbing extremely difficult, which is one of the main reasons the system is chosen. A topping is worth discussing only where there is a specific known risk, an isolated perimeter or an insurance requirement, and we would raise the safety implications first, particularly near public areas.
Yes. Panels are stepped bay by bay with post lengths adjusted so the top line stays consistent, or raked slightly where the fall allows. Because the panels are rigid, setting out matters, and the ground line needs closing off so no gap opens beneath a panel where the ground drops away.
Fixings are the weak point on any panel system, so clamp bars or shrouded security fittings are used where they cannot easily be undone from the attack side, with posts set deep enough that they cannot be rocked out. Where a boundary has been targeted before, we look specifically at how that attempt was made.
On the boundaries that matter, yes. Where a fence line is exposed, unsupervised or has been attacked before, the added climb and cut resistance is the entire point. On lower-risk sides twin-wire is often perfectly adequate, so a mixed specification usually gives better value than applying 358 to a whole perimeter.
Yes. We supply and install 358 prison mesh across Essex and the surrounding areas, including Basildon, Brentwood, Chelmsford, Wickford, Grays, Thurrock, Southend-on-Sea, Romford, Harlow and Colchester. Request a site survey and we will assess the boundary and recommend a configuration, height, finish and gate arrangement.
Get started
Talk to Pro Fencing about your site, security requirements and installation timeframe. We can assess the boundary and recommend a suitable solution.