| Size | Weight Range | SWL (safe working load) |
| No.1 | 0- 10 kg / 0- 22 lb | 10 kg / 22 lb |
| No.2 | 11- 45 kg / 23-100 lb |
45 kg / 100 lb |
| No.3 | 46- 90 kg /101-200 lb | 90 kg / 200 lb |
| No.4 | 91-225 kg /201-495 lb | 225 kg / 495 lb |
| No.5 | 226-325 kg /496-715 lb | 325 kg / 715 lb |
