These are the Tail Mounting Screws for Nexstar Select and ARF. FEATURES: White nylon construction INCLUDES: Two tail mounting screws REQUIRES: Nexstar Select and ARF SPECS: Length: 2-1/2" (63mm) Diameter: 1/2" (12mm) COMMENTS: These are for the Nexstar ARF and Select Versions. mcw 3/16/05 ir/jxs