Harken 40mm Pivoting Lead Block — Cam-Matic® cleat Bottoms They are made from tough

They are made from tough UV stabilized ABS plastic with a shatterproof acrylic lens

zip fastened

and for buried tanks and pipes

UPF 50 fabric (by construction)

and lock-in plate

Harken 40mm Pivoting Lead Block — Cam-Matic® cleat Bottoms They are made from toughHigh strength pivoting lead blocks with cams are used for halyard controls on larger keelboats and as headknockers on dinghies and beachcats for sheeting directly from the boom. Hole spacing and rivet size are the same as Classic models, making upgrades easy. Cam reverses for either up or down cleating. Can be used as becket block. Sheave (mm) 40 mm Sheave (in) 1 9 16 in Length (mm) 112 mm Length (in) 4 1 2 in Weight (g) 186 g Weight (oz) 6. 6 oz