uxcell 10 Pcs Hex Shank Magnetic 3.7mm TT20 Torx Security Screwdriver Bits Weight: 116g; Product Name: Torx Security Screwdriver Bit; Package Content: 10 x Torx Security Screwdriver Bit Main Material: Metal; Head Type: TT20; Main Color: Gray Drive Type: Torx; Features: Magnetic Battery Included: No; Total Length: 50mm/2" Head Size: 3.7mm/0.15"; Hex Shank Diameter: 6.3mm/1/4"