X-Long 6-inch TORX Star Tamper-Proof S2 Steel Driver Bit - TT-25 Professional-grade power tool accessory for TORX (star) and TORX Tamper-Proof fasteners Heat-treated and tempered S2 tool steel absorbs shock, resists twisting and cam-out for durability 6-inch length for tough-access fasteners. Magnetic tips help prevent dropped screws and bolts 1/4-inch quick-change shank fits drill chucks, impact drivers, adapters, extensions and bit holders Sold individually by head size TORX Tamper-Proof: TT-25