Draper expert 3 8 square drive x 1 4 hexagon screwdriver bit holding socket draper expert 16809 b i expert quality i b insert bit holder with spring clip and ball bearing for secure 1 4 bit holding forged from chrome vanadium steel hardened tempered and chrome plated for corrosion resistance display packed draper 16809 3 8 sq drivex1 4 hexagon screwdriver bit holding socket