Size 6 64mm Plain Bearing Pulley Single Block Fixed EyeThe Size 6 Barton blocks are designed as our high-load cruiser block range and are of rugged construction. It features high-grade injection molded side plates, with all load-carrying components from 316-grade stainless steel. Side plates are through-bolted and riveted for added strength and security. This good-looking and versatile range is designed for use on larger cruising and racing yachts. All are designed for ease of use with our ball-bearing mainsheet traveler system.The 64mm sheave Size 6 high load cruiser block range is of rugged construction, featuring high-grade injection molded side plates, with all load-carrying components from 316-grade stainless steel. Side plates are through-bolted and riveted for added strength and security. This good looking and versatile range is designed for use on larger cruising and racing yachts. All are designed for ease of use with our ball bearing mainsheet traveller system.Designed around a 64mm (2 1/2") sheave and to work with 14mm (9/16") ropes.