These 3” ball bearing blocks are the best blocks available for boat lifts. They are hot dipped galvanized 1.5 ton blocks with ball bearings and grease fittings. Blocks are one of the most important parts to a boat lift. Bad blocks will cause friction and will add weight to the hoist. By using our Premium Boat House Lift Parts you can be sure that you’ve purchased the right product to do it right the first time.