Check the listing for details. SRM Origin Lock Ring Tool. Color: Black, Condition: New. Listed at 50.00 USD. SRM Origin Lock Ring ToolThe SRM Origin Carbon Power Meter is compatible with both 24 mm and 30 mm Origin spindles. With the SRM Origin Lock Ring Tool, you can change spindle sizes on your Origin power meter quickly and easily. Please note, SRM Origin Replacement Spindles are sold separately here:24MM: https://www.ebay.com/itm/25359283176130MM: https://www.ebay.com/itm/253746162086 Why Buy from Power Meter City1. We ship fast! All orders ship on the same day your order is placed!2. We are an authorized SRM dealer and this product comes with a full warranty.3. Expert advice and customer service in case you need any help.4. We offer a free, 30-day return policy on new items. About our CompanyAt Power Meter City, we focus on power meters and related accessories and components. Our focus on these products means we can offer you the best possible selection, advice and service. We have been in business since 2016 and are based in southern California. We are an authorized dealer of every product we sell.