William Optics Cat Mounting Ring William Optics Cat Mounting Ring Allows mounting the WO Space Cat Clamshell Type Mounting Ring Suitable to mate with the (Optional) Cat Saddle and Handle This is the William Optics Cat Mounting Ring. This WO Mounting Ring uses the standard clamshell-type open/close attachment method to secure or release your telescope instrument. The Cat Mounting Ring from William Optics is provided in black anodized aluminum construction, with a red color knurled-head screw to secure the ring around your Cat. It provides two M6 threaded holes and one 1/4-20 threaded hole for attaching to your existing mount/tripod. Specifications: Manufacturer: William Optics Mfr. SKU: M-MR50RC-BL Function: Cat Mounting Ring Accepts: Optional Cat Saddle and Handle Bar Material: Aluminum, black anodized color Color: Black