Prime-Line Plain Back Steel Tandem Roller Assembly

Plain back tandem roller assembly with two 1-1/8 inch concave steel ball bearing rollers. The stamped steel housing is adjustable. Used by MIlgard as well as other manufacturers primarily on vinyl patio doors. The housing is 3/4 inches wide and 1 inch tall with a 1/4-20 threaded mounting hole on the back end and an optional use 10-32 threaded hole on the top.