Check the listing for details. 5pcs - T27 Security Torx Bit 1/4" Hex Shank 6" Long Tamper Resistant Star Bits. Color: Silver, Condition: New. Listed at 16.06 USD. 1. The tamper-resistant star bit is made of heat-treated S2 steel, hardness up to HRC58-60, with high strength and wear resistance, anti-bending, anti-breaking, not easy to deform, and durable.2. The tamper-proof Torx drill bit adopts a magnetism design and can absorb screws vertically or tilted. The head is a hexagonal plum blossom shape with a hole, which can make close contact with the screw, making disassembly and installation more stable and less likely to slip.3. The chrome-plated surface is bright and shiny, effectively preventing metal oxidation and corrosion, enhancing hardness and wear resistance for better scratch resistance. Each tamper-resistant screwdriver bit is clearly engraved with the model for easy identification.4.