Ideal for both DIY-ers and professionals alike, these bits are perfect for cylinder head bolts, retaining bolts, drivetrain components, door hardware, and disc brake calipers. 10-Piece XZN Triple Square Spline Bit Socket – 1/4” Drive: M4, M5, M6; 3/8” Drive: M8, M9, M10, M12, M14 (Tamper Proof); 1/2” Drive: M16 (Tamper Proof), M18 (Tamper Proof).