Clamp Type Knurling Tool with knob. This design helps reducing the load on the lathe spindle bearings compared to any other standard knurling tool. Pressure is applied via the turn screw instead of the lathe cross slide. Ideal tool for a small to medium sized lathes. Features medium diamond pattern knurls. Holder Size (Inch) : 5/8 x 3/8 x 3 " Inches Holder Size (mm) : 16 x 9.5 x 75 mm Knurl Dim. (inch) : 3/4 x 3/8 x 1/4 Inches Knurl Dim. (mm) : 19 x 9.5 x 6.35 mm Working Capacity (mm) : 3-25 mm