| Item No. | O.D.(mm) | Working Length(mm) | Jaw Shape | Spike | Coating | Endoscope Channel(mm) |
| NKRF-18T | 1.8 | 1600/1800/2300 | Oval | × | × | 2.0 |
| NKRF-18U | 1.8 | 1600/1800/2300 | Alligator | × | × | 2.0 |
| NKRF-23T | 2.3 | 1600/1800/2300 | Oval | × | × | 2.8 |
| NKRF-23U | 2.3 | 1600/1800/2300 | Alligator | × | × | 2.8 |
| NKRF-23N | 2.3 | 1600/1800/2300 | Oval/Alligator | √ | × | 2.8 |
| NKRF-3023T | 3 | 2300 | Oval | × | × | / |
| NKRF-2315S | 2.3 | 1500 | Round | × | × | 2.8 |