Chrome Vanadium 6150 steel bits hardened to 52-53 HRC and tempered for added strength. Set includes 3/8" and 1/2"Sq drive to 10mm hex Chrome Vanadium steel bit adaptors. Supplied in storage case with inclined tray for quick and easy bit selection. Features & Benefits:Manufactured from Chrome Vanadium steel.Long and short TRX-Star*, spline and hex bits.Includes 3/8" and 1/2"Sq drive to 10mm hex Chrome Vanadium steel bit adaptors.Convenient high-impact storage case presents bits at an angle for easy selection.Contents: TRX-Star* Bits; T20, T25, T30, T40, T45, T50, T55, T60 (1 each 30 and 75mm), Hex Bits; 4, 5, 6, 7, 8, 10, 12mm (1 each 30 and 75mm), Spline Bits; M5, M6, M8, M10, M12 (1 each 30 and 75mm), Drive Adaptors; 3/8"Sq x 10mm Hex, 1/2"Sq x 10mm Hex.Lifetime guarantee*.Model No. AK219 Specifications: Model No AK219 Brand: Premier Contents: TRX-Star* Bits; T20, T25, T30, T40, T45, T50, T55, T60 (1 each 30 & 75mm), Hex Bits; 4, 5, 6, 7, 8, 10, 12mm (1 each 30