RONSTAN BLOCKS: 25MM DOUBLE BLOCK, BECKET, V-JAM CLEAT, SLOT EYE HEAD, ALL PURPOSE 3/16" max. Line. There are many applications for these simple, economical and reliable blocks. Stainless Steel cheeks and Acetal sheaves ensure a long service life with virtually no maintenance. 1"(25mm) sheave diameter, 3/16"(5mm) max. line, 830lb.(375kg) max. Working load, 1650lb.(750kg) breaking load, 2.7 oz.(75g) weight. Ss-RF342 $38.10 Contact Us: OnlineMarineStore.com, PO Box 372060, Key Largo, FL 33037, 305-451-3287 or 305-451-0909, orders@catsailor.com