The Stanley FatMax FMMT13038-0 is a 15mm combination wrench with an open jaw and a 12-point ring end. The anti-slip surface treatment on the open jaw maintains grip on fastener flats under load, which becomes increasingly important as wrench sizes move up and the torque applied during tightening and loosening increases.

15mm is a common size for compression fittings on 15mm copper pipe, which makes this wrench a regular fixture in a plumber's or heating engineer's tool kit. It also covers certain M10 flanged fasteners and appears on industrial valve assemblies, pump connections, and some structural fixings. Having a dedicated 15mm combination rather than reaching for adjustables speeds up work on pipe joints where you may be tightening multiple fittings in sequence.

The ring end provides secure engagement for high-torque applications, while the open end gets around fittings where pipework or adjacent structure blocks ring access. Chrome vanadium steel construction withstands the repeated high-torque cycles that plumbing compression work demands.

Key Specifications: Size: 15mm. Type: Combination (open + 12-point ring). Material: Chrome vanadium steel. Surface: Anti-slip jaw treatment. Model: FMMT13038-0. Weight: 0.099kg. Dimensions: 255 x 24 x 44mm.