Can be attached to reels marked as compatible with Shimano A-type knobs. This is a modified version of the Small A30 parts. Diameter: 30mm, Weight: 17 grams. Please check the manufacturer's website for detailed compatible models. This is a used item, so there may be some minor scratches, but it is in good condition. A washer set is included. Price negotiations are not accepted. We do not offer holds. Thank you for your understanding.