Check the listing for details. 4-Pack Screen Door Rollers, 30mm/1.18" Dia Nylon Single Wheel [White]. Condition: New. Listed at 19.32 USD. PRODUCT APPLICATIONSThese sliding door track wheel are widely used in wardrobes, cabinets, sliding doors, sliding windows, window replacement.PRODUCT DETAILS & INCLUDE√ Material: Iron and Nylon√ Color: White√ Aperture x Hole Distance: 4mm x 54mm / 0.16inch x 2.13inch√ Overall Size: 65mm x 13mm x 30mm x 8mm / 2.7inch x 0.5inch x 1.2inch x 0.3inch ( L x W x Dia x T )√ Package Includes: 4Pcs x Electroplating Sliding Door Window PulleyPRODUCT ADVANTAGES1. Our sliding door wheels use countersunk screws to make installation more secure and reliable. They also use silent bearings so there is no noise or scratches on the floor.2. Our barn door rollers is made of thickened iron and nylon precision castings, and are formed in one piece through multiple processes.