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. Includes a washer set. Price negotiations are not accepted. We do not offer holds. Thank you for your understanding.