Barton Block Fiddle Reverse Shackle
| Size 5 | Size 6 | Size 7 | |
| Weight | 273 g | 350 g | 413 g |
| Dimensions | 185 × 67 × 39 mm | 205 × 77 × 39 mm | 220 × 77 × 50 mm |
| Sheave Size | 54mm x 17mm (2 1/8″ x 5/8″) | 64mm x 18mm (2 1/2″ x 45/64″) | 72mm x 20mm (2 53/64″ x 3/4″) |
| Max rope diameter | 12mm (7/16″) | 14mm (9/16″) | 14mm (9/16″) |
| SWL | 750kg (1650lbs) | 1000kg (2200lbs) | 1250kg (2750lbs) |
| Break load | 1500kg (3300lbs) | 2000kg (4400lbs) | 2500kg (5500lbs) |
| Max rolling load (ball bearing blocks) | 525kg (1157lbs) | 700kg (1543lbs) | 875kg (1929lbs) |

