Series 4 58mm Block Single Cheek Block. Cheek Block. With a plastic backing plate standard to allow snug attachment to spars etc. Base 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 available. Plain bearing blocks. Barton 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 Cheek Block. With a plastic backing plate standard to allow snug attachment to spars etc A strong, lightweight range of blocks for use on dayboats and cruising yachts. Ideal for mainsheets, Length 107mm 4.21 Sheave Size Single 58mm x 17mm 2-1/4 x 5/8