The item is a set of 6pcs simple and practical easy glide bathroom shower door rollers with 22.5mm wheel diameter, which are mainly made of durable stainless steel, hard ABS and brass materials, and suitable for most shower enclosures, shower cabins and steam cabin enclosures. The shower door roller is designed for use with 6-8mm glass doors, and will provide low-friction easy glide motion. Features 6 pieces of the 22.5mm diameter shower door rollers in one set will be sold together. Material: durable stainless steel, brass and hard ABS. Wheel size (Diameter*Thickness): about 22.5mm*7mm. Thread diameter: Approx 4mm. Replacement Bathroom Shower Door Rollers Runner Wheels. Easy glide replacement shower door roller, easy to install and use. Suitable for most shower enclosures, shower cabins and steam cabin enclosures. Designed to suit 6-8mm thickness glass doors.