Ronstan Upright Lead Block 50mm ronstan ball bearing series 30 - single swivel shackle head It does not collapse when

It does not collapse when going in a tight radius

The contour lock system allows it to be a stand alone unit or locked together with other switches

Frame/Cheeks: Toughened

12 x Nuts 3/8" unc Thin Wall Nut  (Takes 1/2" spanner ) (STAINLESS)

Hardware covers

Ronstan Upright Lead Block 50mm ronstan ball bearing series 30 - single swivel shackle head It does not collapse whenThis upright lead block from Ronstan is typically used for halyards at the mast base. Lead blocks are a low profile solution for leading halyards or other rig sail controls back to cleats or jammers. Ideal for high load applications. Manufactured with a wear resistant Nylatron sheave a lightweight self lubricating polymer. This upright block with 50mm sheave is suitable for use with rope or wire. Features: Acetal ball bearings UV stabilised Acetal