The Britool metric short hex keys are made in chrome vanadium steel for torque strength exceeding current standards with a zinc-plated finish. The angles on the end faces are microchamfered for better grip in the screw head. ISO 2936 - DIN 911.The Britool BRIE113922B Short Arm Hexagon Key 10mm has the follwing dimensions:Arm Length: 122mmL Length: 50mmWeight: 104g