About This ★【Includes】 Includes 2 x Sliding Patio Door Roller,used for replacing damaged or missing roller assemblies on sliding patio doors ★【Standard Size】 The roller assembly contains 5/16-inch wheel thickness (width) x 1-1/4-inch diameter, 5-3/4-inch hole centers. This roller assembly has a minimum collapsed height of 1-1/2 in. ★【Solid Construction】High quality radial ball bearings still working after 100,000 cycles for 2 rollers bear 120KG. While others may use the bearings made from Carbon Steel W/O heat treating, we insists all bearings made from Heat Treated Bearing Steel ★【Easy to Install】Remove damaged or missing tandem roller assemblies in patio sliding glass doors , then install new sliding door roller assembly ★【Attention】: Please check the measurement before order. Overview Brand : HauSun Color : Gold Material : Zinc Style : Modern Assembly Required : Yes