Made of Quality Tool Steel - Spring Action Clamp Type Large Capacity Knurling Upto 2" Inch II 50 mm * Include 3 Pairs Left (LH) & Right Hand (RH) Diagonal Lines Knurling Wheels: 0.5 mm , 1.0 mm (Comes fitted to the Holder) & 1.5 mm . * These 3 different set of LH & RH knurls helps to form diamond of different pitches texture. The knurls are hardened & Pitch size are marked on the spare knurls to avoid any confusion. * The spare supplied knurls are easily replaceable through the grub screw in the ejecting pin of the rotating knurls in the holder with the help of snap ring plier. * Easily fits the Standard 4-way Tool Post (*Check the Image in the Listing) & also the Standard Holder of any Quick change tool posts which has minimum tool holding capacity of 10 mm & above. *Epoxy Black Finish for a Rust Free Life. Knurled Body of the Pressure Cap Gives a Easy Grip for applying pressure on the work-piece while working. Side Clamping Bar is 10 x 10 mm Square to hold it in the quick change tool post square to the work-piece (*Check the Image in the listing)