Prime-Line Roller Assembly, Number of Rollers: 1, Bearing Type: Ball, Roller Edge Type: Concave, Roller Width: 5/16 in, Roller Diameter: 1-1/4 in, Steel, Gold, F-Tab Mounting, Dimensions: 1-5/16 in L x 9/16 in W x 1-1/8 in H, Suitable for: Sliding Patio Glass Doors