Stahlwille603738 40 4 01010004 Hex Head Bits 4 mm - Stahlwille 01010004, Stahlwille 40 4 01010004 Hex Head Bits 4 mm - Design according to DIN 3124 and ISO 2725-1. Manufactured from hpq ® high-performance steel, chrome-plated surface. Stahlwille 40 4 01010004 Hex Head Bits 4 mm