Upgrade your patio with the Sliding Glass Patio Door Roller designed specifically for Keller doors. Featuring a durable 1-1/2 inch nylon ball bearing wheel with a center groove, this roller ensures smooth and effortless operation. The wheel is 5/16 inch wide and fits perfectly into an adjustable steel housing that measures 3/4 inch wide. Experience enhanced functionality and effortless access to your outdoor space with this essential component for your patio doors.