The MS04 4-piece mortising chisel & bit set is great for drilling square holes in wood with a mortising machine. Set of 4 includes the following sizes: 8mm, 10mm, 12mm and 16mm. This quality set also comes with a convenient wooden storage case.

| Size | A(mm) | B(mm) | C(mm) | D(mm) | E(mm) |
| 8mm | 19.05 | 70 | 109 | 5.8 | 46 |
| 10mm | 19.05 | 70 | 140 | 6.8 | 76 |
| 12mm | 19.05 | 70 | 140 | 9.8 | 76 |
| 16mm | 19.05 | 70 | 140 | 12 | 76 |