The primary use for a centre drill is to provide a 60° hole for a tailstock centre as a support during turning. The little drill bit on the end gives clearance, and provides an oil reservoir, for the point of the centre.
| S5DHP030 | 3.0 MM | 6 | 28 | 66 |
| S5DHP031 to 037 | 3.1 to 3.7 | 6 | 28 | 66 |
| S5DHP038 to 047 | 3.8 to 4.7 | 6 | 36 | 74 |
| S5DHP048 to 060 | 4.8 to 6.0 | 6 | 44 | 82 |
| S5DHP061 to 070 | 6.1 to 7.0 | 8 | 53 | 91 |
| S5DHP071 to 080 | 7.1 to 8.0 | 8 | 53 | 91 |
| S5DHP081 to 100 | 8.1 to 10.0 | 10 | 61 | 103 |
| S5DHP101 to 120 | 10.1 to 12.0 | 12 | 71 | 118 |
| S5DHP121 to 140 | 12.1 to 14.0 | 14 | 77 | 124 |
| S5DHP141 to 160 | 14.1 to 16.0 | 16 | 83 | 133 |
| S5DHP161 to 180 | 16.1 to 18.0 | 18 | 93 | 143 |
| S5DHP181 to 200 | 18.1 to 20.0 | 20 | 101 | 153 |
