The C-Type Screw Clamps are drop forged from strong special steel and heat-treated. The screws are made from tough, wrought steel, heat treated and threaded for strength and rapid adjustment.
| Code | Opening mm | Code | Opening mm |
| 613716 | 25 | 613721 | 125 |
| 613717 | 38 | 613722 | 150 |
| 613718 | 50 | 613723 | 200 |
| 613719 | 75 | 613724 | 250 |
| 613720 | 100 | 613725 | 300 |