The 15-in-1 Multi-Pro Tamperproof Screwdriver (8141) contains seven double-ended tamperproof bits, including the most popular security bits: • Hex Pin: 1/8+9/64, 5/32+3/16 • Spanner: 6+8, 10+12 • Torx Pin: 10+15, 20+25, 27+30 The Retractable Bit Cartridge in the handle makes storing, selecting and changing bits quick and easy while saving toolbox space and reducing the risk of lost parts. The Palm Saver Cap—the largest cap surface in the hand tools industry—remains stationary while turning the driver handle, which provides comfort, prevents blisters and enables one-handed use. The EZ-Guide Collar delivers greater control by maintaining alignment between the screwdriver and the fastener. An alloy steel shaft and engineered nylon/ABS handle make these tools nearly impossible to break. And the shaft opening also serves as a 1/4 in. hex driver.