TORX Driver Bit - T15 3-1/2" Quick-Change Shank,PTC" /> Heavy-duty TORX bits available in individual size and length for industrial/commercial applications Industrial-grade hardened and tempered SK2 tool-steel resists stripping and cam-out Quick-change 1/4" shank works with adapters for lightning-fast swaps; secure fit in all drill chucks Fits all T15 TORX-head ('star') fasteners; most-used 3-1/2" length Dozens of other sizes and lengths available; all professional grade