ShoreStation offers centering guides that are adjustable in width and in height. The contact surface with the boat is primarily a carpeted piece of lumber at the boat’s widest area. This is used as a mid-step for accessing the boat from the dock. You need to specify the boat lift model to acquire the proper centering guide. ShoreStation has four different products. The first is for all-aluminum manual vertical boat lifts from 1,500 lbs. to 4,000 lbs. The second is for boat lifts that are 4,000 lbs. hydraulic, 5,000 lbs. manual or 6,000 lbs. (either manual or hydraulic). The third is for 8,000 lbs. and 10,000 lbs. hydraulic lifts. The fourth, for 15,000 lbs., is our WSI Heavy Duty PVC roller guides option. Optional centering guides include the WSI-PVC roller guides, which make it easy to enter and leave the lift. The PVC contact point is the boat’s rub rail, which protrudes from the fiberglass. The most durable, user-friendly, and longest lasting centering guides are the ShoreStation Aluminum vertical boat lifts.