1. High Grade SteelEach piece in the security bit set is made of durable, heavy-duty, high-grade carbon steel and is sandblasted to improve wear resistance and ensure longevity, withstanding extremely high torque output and providing maximum durability. 2. IncludesSecurity bit set includes 9 pieces Temper Torx TR8, TR10, TR15, TR20, TR25, TR27, TR30, TR35, TR40; 6 pieces Tamper-proof imperial hex head: 532, 964, 18, 764, 332, 564 in. ; 6 pieces Tamper-proof metric hexagonal bits: 2, 2.5, 3, 4, 5, 6 mm; 4 pieces Three-wing drill bit: 1, 2, 3, 4; 3 pieces three phases. Drill bit: 6, 8, 10 mm; 4 pieces Wrench bit: 4, 6, 8, 10 mm; 1 piece Magnetic extension bit holder; 1 piece 32 slot organizer. 3. Easy to useThis security bit set has a convenient drill bit adapter for easy access to most drills. Use it for home or work projects where extra security is needed. The precision machined bit tip ensures precise sizing and smoother insertion of the chamfered bit end into the fastener. 4. PrecisionSecurity bit set machining ensures precise size and fit while the chamfered bit end inserts smoothly into the fastener and protects the bit and fastener from damaging edges. Machined aluminum guides with spring-loaded ball bearings on each clip securely hold the bit holder even when upside down.