Check the listing for details. Telescope clamp, inner diameter 90-288mm, telescope ring. Condition: Open box. Listed at 29.99 USD. Description The price includes a pair of telescope rings Before purchasing, please measure the outer diameter of your telescope tube and choose the right ring All telescope rings are all metal, All types of telescope rings can be expanded by about 0-3mm Different styles have different colors and styles. Please refer to the pictures corresponding to the options before purchasing Payment Terms Payment must be received within 7 business days of auction closing.All our items will be shipped to buyer's payment address. So please check your shipping address before you make the payment. Shipping Terms Normally, we will arrange the shipment within 2 business days of receipt of payments.A tracking number will be emailed to the buyer at the time of shipment. Feedback If you are satisfied with our product and service, please leave 5 star positive feedback.However, if you are unhappy with the item or our service,please contact us before you leave the negative feedback. About US We are Skyoptikst Optical Technology CO., LTD. More information,please click our web site.If you have any questions please contact us.