Barton Size 0 Plain Block Triple Fixed Eye A strong, lightweight block ideal for use on dinghies and dayboats or as lead blocks on larger craft. Sheave size: 20mm x 8mm (25/32 x 5/16inch) Max rope diameter: 5mm (3/16inch) SWL: 275kg (606lbs) Break load: 550Kg (1210 lbs) Length: 50.4mm Weight: 55g