25.4 circle prism  Prism constant: +17.5mm (When you use it to total station Description： Mini prism for total station 5/8" X 11 mounting thread  100% Brand New , High Quality What you see in the picture is what you get. Payment: We accept PayPal only. All major credit cards are accepted through secure payment processor PayPal. Payment must be received within 7 business days of auction closing. We ship to your eBay address. Please make sure your eBay address is correct before you pay. Other Policies: We are not responsible for any custom duty or import tax. Serious Buyer Only! Please place bid only if you agree with all the terms. If you make a big deal,there will be more discount. Please contact to me.