It is used for centering casing and tubing columns and preventing damage to equipment during their descent into the well.
| Nominal pipe diameter, in | 4,02 | 4,49 | 5,51 | 6,61 | 7,01 | 9,65 |
| Outer diameter at the blades, in | 4,80…5,39 | 5,12…5,59 | 6,22…7,13 | 7,36…8,43 | 7,68…8,43 | 10,43…11,69 |
| Length, max, in | 7,87 | 7,87 | 11,81 | 11,81 | 11,81 | 11,81 |
| Inner diameter (+0,08), in | 4,09 | 4,57 | 5,63 | 6,73 | 7,13 | 9,76 |
| Body diameter (±0,04), in | 4,57 | 4,92 | 6,02 | 7,17 | 7,48 | 10,2 |
| Blade width, in | 1,18 | 1,18 | 1,57 | 1,57 | 1,57 | 1,97 |
| Screw hole size | М10 | М10 | М16 | М16 | М16 | М16 |
| Nominal pipe diameter, mm | 102,1 | 114,0 | 140,0 | 168,0 | 178,0 | 245,1 |
| Outer diameter at the blades, mm | 121,9…136,9 | 130,0…142,0 | 158,0…186,9 | 186,9…214,1 | 195,1…214,1 | 264,9…296,9 |
| Length, max, mm | 200 | 200 | 300 | 300 | 300 | 300 |
| Inner diameter (+0,08), mm | 104,0 | 116,0 | 117,6 | 171,0 | 181,1 | 257,9 |
| Body diameter (±0,04), mm | 116,0 | 125,0 | 152,9 | 182,1 | 190,0 | 259,0 |
| Blade width, mm | 30,0 | 30,0 | 39,9 | 39,9 | 39,9 | 50,0 |
| Screw hole size | М10 | М10 | М16 | М16 | М16 | М16 |
