Titanium coated bits for maximum tip durability Designed for maximum strength with minimal wall thickness made possible by tough materials, advanced processing technology, and optimal heat treatment. Exceptional surface finish- Proprietary hard chrome plating for anti-wear, anti-corrosion, and superior appearance. Rubber ring prevents slippage and improves workability during hand-tightening. Set contents T8,T10,T15,T20,T25,T27,T30, socket holder