Wera 05071090001 3867/4 1/4'' Hex Stainless Steel Torx BO Power Drive Bits is for recessed TORX® screws and are made out of stainless steel which prevents the formation of unsightly extraneous rust. Wera 3867/4 1/4'' Hex Torx BO Stainless Steel Bit With Bore Holes is suitable for holders as per DIN ISO 1173-F 6.3.