Series 4 58mm Block - Single - Cheek BlockCheek BlockWith a plastic backing plate standard to allow snug attachment to spars etcBase size 107mm x 67mm (4.21" x 2.64")Fastenings 5mm.A strong, lightweight range of blocks for use on dayboats and cruising yachts. Ideal for mainsheets, vang tackles, lead blocks or wherever a powerful and compact purchase tackle is required.A comprehensive range of cam cleat, fiddle, and fiddle & cam cleat versions are availablePlain bearing blocksBarton plain bearing blocks have a precision moulded Acetal sheave running on a large diameter brass bearing, ensuring free running under the highest of loads.Length:107mm(4.21")Sheave Size: Single: 58mm x 17mm (2-1/4" x 5/8")Fiddle: 32/58mm x 17mm (1-1/4" / 2-1/4"; x 5/8")SWL: 630kg (1,385lbs)Max Rope Diameter: 12mm (7/16")Break Load:1260kg (2,770lbs)