Prime-Line 1-1/2 in. Steel Ball Bearing Sliding Door Roller Assembly, Doormaster

This is a "K" tab patio door roller assembly with a 1-1/2 in. concave steel ball bearing roller. The "T" shaped tab (K-tab) is simply slid up into a T shaped receptacle in the bottom of the patio door. No screws are required. The housing is 3/4 in. wide and 1-1/2 in. tall with an adjustment screw on the back end. Used by Doormaster and a variety of other patio door manufacturers.