Foxnovo 6pcs Replacement Bathroom Shower Door Rollers Runner Wheels 27mm Wheel Diameter 6 pieces of the 25mm diameter shower door rollers in one set will be sold together. Wheel size (Diameter*Thickness): about 27mm*5.5mm; Overall length: about 31mm. 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.