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 BRIE113916B Short Arm Hexagon Key 4mm has the following dimensions:
Arm Length: 74mm
L Length: 29mm
Weight: 10g