Prime-Line Products D 1512 Sliding Door Roller Assembly with 1-1/4-Inch Nylon Ball Bearing For use with sliding glass doors Adjustable steel housing with a 1-1/4 in. nylon ball bearing roller Housing dimensions: W: 11/16in. L: 1-1/8in. H: 1-15/16in. Overall thickness: 13/16in. Adjustable steel housing assembly