Wera Stainless 3840/1 TS 2.0mm Hex Insert Bit, 1/4-Inch Drive Stainless 1/4 hex drive 2.0mm Hex-Plus insert bit, 3/32 hex x 1 Manufactured from 100% Stainless steel, preventing extraneous rust caused by use of conventional tools contaminating stainless fasteners Torsion bits are designed to prevent premature wear and improved service life Hex-Plus technology prevents rounding of screw recess and transfers up to 20% more torque Limited Lifetime Warranty, German Engineered