The Nikcole mini-system is designed for cut-off and grooving under .078". Nikcole Mini-Groove kit contains 1/2" square shank right hand tool holder, 5 carbide TiN coated SG style grooving inserts, key, and extra screw. Widths of inserts are: .035", .043", .051", .063", and .073". Interchangeable with all Nickole Mini-Groove RH holders and inserts. (LH holders are required for LH inserts) Other inserts can be used for threading, turning, and full-radius grooving. 2 cutting edges on each insert. Made in USA.