●Slot Length: 2-3/8"; Length Under Head: 2-3/4"; Head Thickness: 1/2" ●Made of high quality tool steel ●Tool Holder Bushing for universal use on CNC turning machines to adapt a wide variety of boring bars, drills, reamers and shank type tools ●Hardened and precision ground to highest concentricity ●OD tolerance is within H6 and ID tolerance is within H7