Constructed of an all aluminum alloy, these blocks are lightweight yet strong and durable. Their large throat openings allow for passage of most sleeves and connectors. The 79mm (3 1/8”) urethane lined sheaves prevent damage to the conductor and run smoothly on metal shielded bearings with a graphite lubricant.
| Model | A |
| 4722-1ALU | 558mm (22”) |
| 4728-1ALU | 711mm (28”) |
| Model | B |
| 4722-1ALU | 79mm (3 1/8”) |
| 4728-1ALU | 82mm (3 1/4”) |
| Model | C |
| 4722-1ALU | 144mm (5 11/16”) |
| 4728-1ALU | 147mm (5 13/16”) |
| Model | D |
| 4722-1ALU | 801mm (31 9/16”) |
| 4728-1ALU | 954mm (37 9/16”) |
| Model | Working Load | Weight |
| 4722-1ALU | 5440 kg (12,000 lb) | 22 kg (49 lbs) |
| 4728-1ALU | 5440 kg (12,000 lb) | 28 kg (61 lbs) |
