HSS Tool Bits 1. Shape: round, square, rectangle; 2. Allover Length: 4", ... .It has different shapes: round tool bits, square tool bits, rectangle tool bits;2. Application: Universal square tool bits are suitable both for cutting ... . Excellent materials like M35 and M42 are used for cutting super hardness materials.4. Materials :W4, M2,W9,M35,M42;5 ...