New from Antal the ONE PIECE FRAME block, the block without pins or screws is a light and strong solution: simply a hard black anodized and teflon coated aluminum frame in one piece.
A complete range from 60 to 160 mm sheaves in single, double, triple, fiddle, and deck versions, for webbing or shackle connection.

Sizes are based on the available range of HR shackles, on their safe working load (W) and breaking strength (R). So the following 7 sizes from 60 to 160 mm.