Twin Sheet Lead Blocks feature an extra wide sheave that allows two sheets to be run through the cage at the same time. Great when changing sails. This low profile design keeps sheet under load closer to the deck and uses a super-smooth Nomex/ Teflon bearing to handle friction. Black aluminum anodized finish. Track Size 1" x 1/8", Boat Size Up To 29', Sheave Dia. 1-1/2", Max Line (2) 1/2", L 3-1/2", W 1-11/32", H 3-9/32", SWL 2500 lbs., Weight 10 oz.