【Side Adjustment】This common tandem roller wheels features a 1 1/4" steel concave ball bearing wheel and a side adjuster that is accessed through the face of the sliding door panel. Easy adjustable with a flat or cross head screwdriver. 【Old Door Rollers Replacement】Replace the door rollers not the door!! If your sliding patio door start getting stuck or hard to silde open, maybe it's time to replace with our sliding patio door rollers. These wheels are compatible with common wood, extruded aluminum or vinyl framed sliding glass doors manufactured by Jeld Wen, Truth 31761A & Truth 30410, Milgard, Marvin, Malta, Peachtree, Weathershield, Pozzi, Hurd, Lincoln, Caradco, Eagle, K&K - Kolbe & Kolbe, Andersen and others. 【Standard Dimension】Heavy duty 1-1/4 inch steel ball bearing wheel with 11/16 inch thick housing and 5-3/4 inch hole centers. For further dimensional information, please see the line drawing. 【Durable and Solid Construction】The sliding patio door roller made of high quality radial ball bearings still working after 100,000 cycles for 2 rollers bear 330 pounds (150kg). While others may use the bearings made from Carbon Steel W/O heat treating, We insists all bearings made from Heat Treated Bearing Steel. 【Smooth and Quiet Operation】The precision-engineered 1-1/4 inch wheels ensure seamless gliding, eliminating sticking, squeaking, or jerky movements.