The Stanley FatMax FMMT13041-0 is an 18mm combination wrench with an open jaw and a 12-point ring end. At this size, the anti-slip jaw treatment is more than a convenience. The torque loads generated when breaking loose 18mm fasteners are high enough that an open jaw without positive grip will round the fastener corners before you get movement, particularly on corroded fixings exposed to weather.

18mm covers M12 flanged bolts and certain M14 hex fasteners. These appear on heavy structural connections, plant mounting bolts, vehicle chassis fixings, and industrial pipework flanges. This is the size range where you start to feel the difference between a quality chrome vanadium wrench and a cheaper tool. The CV steel in the FatMax range maintains its hardness and shape under repeated high-torque loading without cracking or spreading at the jaw.

The 12-point ring end provides maximum grip for the heaviest applications, engaging the fastener in 30-degree increments for repositioning in confined spaces. The open end handles situations where ring access is blocked. At 140g this is a solid, substantial wrench that transmits force efficiently without excess weight.

Key Specifications: Size: 18mm. Type: Combination (open + 12-point ring). Material: Chrome vanadium steel. Surface: Anti-slip jaw treatment. Model: FMMT13041-0. Weight: 0.14kg. Dimensions: 296 x 30 x 44mm.