This is a set of aluminum handle nuts and retainers for ABU reels! The size is M8. Please check the screws as there are left and right types. Right-hand reels use right-hand threads, and left-hand reels use left-hand threads (reverse threads). Please note that old ABU 5001C reels, for example, have left-hand handles but use right-hand threads. Material: Aluminum alloy (A2017) Main Dimensions: Nut size: 10mm across flats Screw diameter: M8 Weight: Approximately 0.8g Compatible Models: Can be used with ABU baitcasting reels up to the 6000 series. Right-hand threads are compatible with right-hand handle reels. Left-hand threads are compatible with left-hand handle reels. This is a retainer that can be used with ABU 4000-6000 series, Morrum SX series, etc. The distance between the center of the handle nut and the center of the screw hole for fixing the retainer is 12.5mm. Please note that some old ABU reels, even in the 4000 and 5000 series, may use retainers with a 10mm pitch. Various colors are available for color matching. You can coordinate colors with the spool, handle, retainer, etc. Material: Aluminum alloy Main Dimensions: Usable nut size: 10mm across flats Pitch between nut and fixing hole: 12.5mm Weight: Approximately 0.6g Compatible Reels: ABU 4000-6000 series ABU Morrum SX series, and many others Please check the size before purchasing. Price negotiations are not accepted.