Indexible Tool Holder Set includes five 6 mm (.235 inch) square x 2-1/2 inch long blackened steel shanks. Fits MicroLux and other mini lathe tool holders. Triangular carbide inserts with 1/64 inch radius cutting tips index to 3 positions to restore the cutting edge when needed. Grade PC300 TiN-TiC-TiN coated for cutting at higher speeds and with greater lubricity. Includes 5 cutting angles: 2 left, 2 right, and 1 center, plus T8 wrench for retaining screws.