Torx Screwdriver Bits - SODIAL(R) 6.3mm Hexagon Shank 4mm T20 Magnetic Tip Torx Screwdriver Bits 10 Pcs Product Name : Torx Screwdriver Bits Bit Type : T20 Tip Diameter : 4mm / 0.16" Shank Diameter : 6.3mm Total Length : 50mm / 2"