This Faithfull Impact Screwdriver Bit Set contains 42 professional 1/4in hex drive impact bits that are specifically designed for use in high torque impact drivers. Manufactured from a unique material specially engineered for extreme durability, these bits have an increased working life compared to standard screwdriver bits. Impact bits are designed to distribute impacts evenly, preventing energy waste for efficient screwdriving, and incorporate torsion areas to absorb torque peaks, reducing stress at the bit tip during heavy loading. All bits feature a precision-machined tip to provide an optimum fit, helping to prevent screw stripping and cam-out. Supplied in a sturdy impact-resistant plastic storage case. Contains: 8 x 25mm Phillips Bits: PH1(x3), PH2(x3) and PH3(x2)12 x 25mm Pozidriv Bits: PZ1, PZ2(x8) and PZ3(x3)11 x 25mm Star Bits: TX10, TX15, TX20(x2), TX25(x4), TX27, TX30 and TX401 x 25mm Slotted Bit: 6mm 2 x 50mm Phillips Bits: PH1 and PH23 x 50mm Pozidriv Bits: PZ2(x2) and PZ