2  x Merlyn Original Parts = Two Complete TOP Carriers (1 carrier shown in picture)  Fit 6mm to 8mm glass Marine grade (304) stainless steel balls. Wheel diameter is 23.5mm x 6mm Swivel action suitable for quadrant systems Suitable for systems with 10-12mm GLASS HOLES - NO MORE than 15mm from centre of hole to glass edge Used on Merlyn Series 6 & 8 product Carrier Size - W 27mm, H 34mm (Check dimensions to be certain of suitability.) Please allow 4+ days for delivery