Prime-Line Products D 1607 Roller Assembly， 1-1/4 in. Tandem Wheels， Concave Edge， Steel Ball Bearings， Adjustable<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>This steel ball bearing roller assembly is used to replace damaged or missing tandem roller assemblies in patio sliding glass doors</li><li>5/16 in. wheel thickness (width) x 1-1/4 in.， 5-3/4 in. hole centers， 11/16 in. wide housing， 1-3/16 in. housing height， 4-5/8 in. housing length</li><li>Adjustable height with minimum collapsed height at 1-1/2 in.</li><li>Steel housing construction with steel ball bearing wheels</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41NrMQZXDHL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51aFq3ss5ZL.jpg" noproxy>