![Ronstan Series 40 Ball Bearing Block - Single Upright Lead Ronstan Series 40 Ball Bearing Block - Single Upright Lead](https://cdn11.bigcommerce.com/s-pr9amv4/images/stencil/200x200/products/56546/77623/70615XL__32361.1520401872.jpg?c=2)
Nylatron Sheave Box - Single Upright Lead Block
Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers.When mounted in an inverted position, are frequently used as upright leads.
Features:
The external tabs can be formed to fit the spar profile before fastening
Applications:
Typically used in dinghy spars for control lines such as outhauls
Materials: