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Supplied as a pack of 4. Made with 304 grade stainless steel balls these quality replacement rollers are designed to last. Supplied with nylon inserts, to fit 12mm glass holes the shaft is offset to allow for easy height adjustment. These are 6mm thick and available with 19mm, 23.5mm, 25mm and 27mm diameter wheels 25mm is a popular size so sent as standard, request other sizes via message at checkout .