The Barton Size 5 Single Block – Variloc with Shackle is designed for larger cruising and racing yachts with nylon sheaves suitable for all ropes, including braided dyneema. Newly designed for 2019 onwards, the Barton Blocks are known as great value for money and practical for many applications. For racing applications, consider getting the ball bearing versions.The Variloc Strip Shackle can be adjusted at 30 positions in relation to the sheave. Inverting the plastic locking piece converts the block to a swivel.Barton Size 5 Blocks are high-load cruiser blocks of rugged construction, featuring injection moulded side plates with all load-carrying components from 316 grade stainless steel. Side plates are through-bolted and riveted for added strength and security.SpecificationsBrand: BartonWeight: 195 gDimensions: 128 58 37 mmSize: 5 (54 mm)Block Type: VarilocNumber of Sheaves: SingleBearing Type: PlainSheave Size: 54 mm 17 mm (2 1/8″ 5/8″)Maximum Rope Diameter: 12 mm (7/16″)Safe Working Load (SWL): 750 kg (1,650 lbs)Breaking Load: 1,500 kg (3,300 lbs)Max Rolling Load (Ball Bearing Blocks): 525 kg (1,157 lbs)