... : round, square, rectangle; 2. Allover Length: 4", 6", 8", 12"; 3. Material: M42, M35, M2, W9, F4,W4 HSS tool bits:1 ... .It has different shapes: round tool bits, square tool bits, rectangle tool bits;2. Application: Universal square tool bits are suitable both for cutting metal ... hardness materials.4. Materials :W4, M2,W9,M35,M42;5.High quality and competitive price;6. SIze: Overall length:4",6", 8 ...