General description These shower door rollers are designed for both upper and lower sliding shower doors, suitable for flat and curved glass doors. The set includes 4 pieces: 2 upper rollers and 2 lower rollers. Technical specifications Diameter of wheels: 23mm Material: Robust zinc alloy Wheel type: Smooth ball bearing with wear-resistant nylon Installation Upper rollers can be adjusted using adjustment screws Secure mounting with button rollers featuring springs