EASY TO INSTALLEach sliding patio door roller hardware comes with 2 screws, the installation process is simple and easy, and it is not easy to fall off after installation. Just remov-e the old roller from the sliding glass door and install the new one.WIDE APPLICATIONSliding patio door rollers are versatile and suitable for most doors, and can be used for sliding glass doors, screen doors, sliding doors, windows, vinyl patio doors, closets, etc. Please refer to the detailed dimensions before purchasing to ensure that they will fit your door.PACKAGE CONTENTYou will receive 2pcs sliding patio door tandem rollers. Size(LxWxH, not includes wheel) about 8x1.76x2.6cm/3.15x0.693x1.024inch. Wheel thickness about 0.79cm/ 5/16-inch, diameter 3.2cm/1-1/4-inch.REPLACEMENT PARTThe sliding door roller can be used to replace your old or broken, poorly functioning rollers, providing your patio door with a smooth, noiseless sliding experience, more comfortable and more convenient.DURABLE MATERIALThis sliding patio door roller is made of solid iron metal and radial ball bearings, with high strength, strong load-bearing capacity, wear-resistant, durable, solid structure, stable and not easy to break, long service life.