The Vortex Sure Fit case in size L effectively protects your optics against rain, dust and mechanical damage. The cover is very easy to put on and remove from the telescope. If it becomes heavily soiled (eg with mud), rinse it with water in a nearby stream or throw it in the washing machine. The L size fits on 356 mm to 394 mm telescopes. Dedicated to the following models of Vortex spotting scopes: RAZOR HD? PST-210S1-A PST-210S1-M PST-416S1-A PST-416S1-M PST-416F1-A PST-416F1-M RZR-31802 RZR-31803 VIPER? PST PST-624S1-A PST-624S1-M PST-624F1-A PST-624F1-M PST-43127 PST-43128 VIPER? HS VHS-4317 VHS-4319 DIAMONDBACK? HP DBK-10011 DBK-10013 DBK-10015 DBK-10017 DBK-10019 DBK-10021 CROSSFIRE? II CF2-31049