This is a Studio Ocean Mark handle for Shimano reels. The mounting holes are 7x4mm, with a 90mm pitch. It was installed on a 05 Calcutta with a modified retainer. The original blue retainer is also included. The rubber on the knobs shows no signs of deterioration. It's in very good condition with no noticeable scratches, but there are some minor scratches from use. Please check the condition in the images. No claims or returns accepted.