Irwin Insert bits are engineered for maximum durability and long life. The bits are forged rather than milled so the fit more precisely whcih reduces stripping and increases the life of the bit itself. Bits are manufactured with heavy-duty cold-forged, high-grade steel. 

Features & Specifications

• Phillip PH #1, #2, #3; SQUARE SQ #1, #2, #3; Torque: T6, T7, T8, T9, T10, T15, T20, T25, T27, T30, T40; TR: TR 10, TR15, TR20, TR25, TR 27, TR30, TR40; Allen HEX: 2mm, 3mm, 4mm, 5mm, 6mm, 8mm. 1/4" hex drive bits
• 25mm long
• Bits stored in holder
• Built for maximum  durability and long life 
• Forged bit (vs. milled) for superior fitment, which reduces stripping and increases life