These alloy sheave boxes from Allen have a plain bearing acteal resin and are suitable for all types of halyard systems.
Technical Specifications:
| Sheave Width | 8mm | 8mm |
| Sheave Diameter | 25mm | 38mm |
| Slot Size | 44mm x 13mm | 52mm x 15mm |
| Weight | 31g | 48g |
| Hole Centres | 57mm | 65mm |
| Hole Size | 4mm | 4mm |


