Uxcell a15012800ux0483 1/4-Inch Hex Shank Magnetic T20 Torx Security Screwdriver Bits 12 Pcs (Pack of 12) Product Name : Torn Security Screwdriver Bit; Tip Size : T20 Hex Shank Size : 6.3mm / 1/4";Bit Length : 10mm / 0.4" Overall Length : 25mm / 1";Material : S2