Series 4 58mm Block Single Stanchion Lead. Stanchion lead. Designed for use on 25mm tubes, with a swivelling action with up-down movement allowing for a fair lead on control lines. 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 140mm 5.51 . 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 Stanchion lead. Designed for use on 25mm tubes, with a swivelling action with up-down movement allow Plain bearing blocks. Barton plain bearing blocks have a precision moulded Acetal sheave running on 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 1,3