Our Shower Door Rollers adopt electroplating plastic alloy which is no worry about rust, on the other hand, while ensuring the strength of the shower door rollers, the plastic alloy greatly reduces the risk of glass breakage due to collisions. These shower door wheels fit 4-6mm glass thickness and 12-14mm glass opening, wheel diameter 23mm, there are 4 extra anti-collision blocks to better protect your shower door. Adjust the height of the wheel by upper screw.(7-8mm adjustable) These shower door wheels fit 4-6mm glass thickness and 12-14mm glass opening, wheel diameter 23mm, there are 4 extra anti-collision blocks to better protect your shower door. Adjust the height of the wheel by upper screw.(7-8mm adjustable) These shower door wheels fit 4-6mm glass thickness and 12-14mm glass opening, wheel diameter 23mm, there are 4 extra anti-collision blocks to better protect your shower door. Additional anti-collision to better protect your shower door A pair of shower door rollers can bear