Ronstan Series 60 Single Fiddle Block, Cam Cleat Shackles and Big Bullet sheaves are

and Big Bullet sheaves are Delrin with Delrin® ball bearings

Chain Sizes: 5/16BBB or HT 3/8BBB or HT

and guard are molded from glass-reinforced polymers for a high strength-to-weight ratio

Suits 16mm (5/8") dia

Use of other re-arm kits may result in improper operation or failure to operate and will void the product's warranty

Ronstan Series 60 Single Fiddle Block, Cam Cleat Shackles and Big Bullet sheaves areCore Blocks are a true all round solution. A tuned 2 stage bearing system provides excellent performance across the full working load range with an integrated thrust bearing feature and the resilience to handle high dynamic or static loads. Acetal sheave, alloy cheeks and stainless fixings complete the durable package. For reliability and a long service life, these blocks are the right choice for sheets, halyards and control line applications for