Prestacycle Bicycle Tool Bits - (4) Piece S2 Long Bit Set DESIGN - Bicycle Specific Bits for Recessed and hard-to-reach bolts. QUALITY - Hardened S2 steel bits resist wear. ADVANTAGE - Stronger and longer lasting than any other tools made for bicycles. INCLUDES - 4/5mm hex ball head, T25 TORX 1/4 socket adapter, 100mm magnetic bit extension