Series 20 Single Ball Bearing Block. Precision moulded Acetal sheaves running on stainless steel or Torlon ball bearings provide high performance & low friction. Low friction. High static and dynamic load capacity. Lightweight. Use for dinghy control lines, dinghy vangs, cunninghams,traveller controls. Non swivel. Fixed single loop. Materials: Stainless steel ball bearings. UV stabilised Acetal sheave. Marine Grade 316 stainless steel load strap and head fitting. Impact and UV resistant, fibre reinforced Nylon cheeks. Dimensions: Sheave ?: 20 mm Max. Rope ?:4mm - 6mm Pin ?: 3.0mm