Cheap And Discounts SRH Type Locating Snap Ring with Collar 6/8/10/20/30/40mm ID Clamping Ring 8/10/12/15.5mm Thickness Fixed Loop for Optical Axis Wholesale. Buy Directly From Merchant Sumray Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.