... Tool Bits 1. Shape: round, square, rectangle; 2. Allover Length: 4", 6", 8", 12"; 3. Material: M42, M35, M2, W9, F4 ... ;2. Application: Universal square tool bits are suitable both for cutting metal materials and non-metal materials.3. Excellent materials like ... M35 and M42 are used for cutting super hardness materials.4. Materials :W4, M2,W9,M35,M42;5.High ...