Wera 3851/4 Stainless Phillips #1 power bit for 1/4" hex drive is designed to keep rust at bay. Wera's Stainless tool line is manufactured from 100% Stainless steel, preventing extraneous rust caused by use of conventional tools contaminating stainless fasteners. Wera's unique vacuum ice-hardened process gives the necessary hardness for industrial applications. Stainless bits partnered with Wera's stainless Rapidaptor will protect the full length of the bit against extraneous rust. Ice-blue design features make the stainless tools easy to identify. German engineered. Bit dimensions: 1/4” hex drive; PH1 x 3-1/2 inch. Wera – The Best Tools For The Job!