Harken's Carbo Ratchet Swivel Blocks allow sailors to hand-hold loaded lines and offer balance between holding power and controlled easing. All three sailing blocks have ON/OFF switches, so you can stop the block going back on itself.
Technical Specifications:
| Sheave Diameter | 40mm | 57mm | 75mm |
| Length | 86mm | 103mm | 137mm |
| Weight | 49g | 85g | 227g |
| Shackle Pin Diameter | 4mm | 5mm | 6mm |
| Maximum Line Diameter | 10mm | 10mm | 12mm |
| Maximum Working Load | 136kg | 227kg | 341kg |
| Breaking Load | 454kg | 907kg | 1361kg |


