Package Include: Set of 4 Twin Shower Door Rollers (2pcs top and 2pcs bottom) Electroplated Door Rollers: 23mm(dia) wheel top bottom shower door rollers, plated surface, rustproof; fit for thickness of 4-6mm glass door, glass open-hole of 12-14mm. These replacement shower door roller is suitable for most shower enclosures, shower cabins and steam cabin enclosures, installed on the top and bottom of shower door, to make it easy to open and close. These replacement shower door roller is suitable for most shower enclosures, shower cabins and steam cabin enclosures, installed on the top and bottom of shower door, to make it easy to open and close. No Noise to open the shower door and these glass door roller help it slide smoothly. It is easy to Install and Maintenance.