Ronstan 1/4" D Shackle Murrays Part# 21-0617 The Ronstan 1/4" D shackle is a stainless steel marine grade shackle with a 1/4" diameter pin. These shackles are super useful and are used all over most sail boats. They commonly connect the main sheet pulleys to the boom and rear crossbar or mainsheet traveler car. Ronstan solid stainless steel shackle has 1/4" pin diameter. Having a spare on hand may mean the difference between sailing or not!Specifications: P.L. B.L. (lb.) 3090 U.D.L. B.L. (lb.) 5070 Weight (oz) 0.9 UDL BL - The “Uniformly Distributed Load” breaking load of the shackle; the load is applied across the full span of the shackle pin. PL BL - The “Point Load” breaking load of the shackle; the load is only applied at the center or one side of the shackle pin. Details: A (in) 1/4 B (in) 7/8 C (in) 9/16 Ronstan Part# RF617 Prindle Part number 9909 - Furler system
