Ronstan Series 60 Core Block - Stand-Up, Swivel ronstan series 30 exit box - ball bearing double cover plate The Outer case is made

The Outer case is  made of either

Its 3 spoke design

Impellers should be replaced at least once every year or sooner depending on engine duty

Fixing Screws

Ronstan Series 60 Core Block - Stand-Up, Swivel ronstan series 30 exit box - ball bearing double cover plate The Outer case is madeCore 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