| Property | Rock bolt with shells include convex edges (RB-M24) | Rock bolt with shells include concave bits (R-DCA-A4) |
| Inner diameter (mm) | 20 | 20 |
| Outer diameter (mm) | 25 | 25 |
| Length (mm) | 1000 | 1000 |
| Tensile strength of steel road (MPa) | 500 | 500 |