Package Content: Set of 4 twin shower door rollers (2pcs top 2pcs bottom). Galvanized Door Rollers: 23mm (diameter) top bottom double shower door rollers, surface plated, rustproof; Suitable for glass door thickness 4-6mm, glass open hole 13.5-14mm. These Replacement Shower Door Wheels are suitable for most shower enclosures, shower stalls steam rooms, installed at the top bottom of the shower door, for easy opening closing.< /li> No noise to open the shower door these glass shower door rollers help it slide in Material SuitableOur Shower Door Roller Sliders adopts electroplating plastic alloy which is not worried about rust, on the other side, while ensuring the strength of the shower door roller slides, the alloy of plastic greatly reduces the risk of glass breakage due to collisions.Copper swing stainless steel screws shall make the product more durable.Rollers at the topThese shower door wheels fit a thickness 4-6mm glass opening 13.5-14mm glass opening, 23mm wheel diameter, there are 4 extra anti-collision blocks to best protect your shower door.Adjust the height of the glass by screw.Rollers at the bottomThe height of the bottom wheel is adjusted according to the top wheel.