FC-5 Vortex Optics Flip Cap Optic Cover Size 5 The hinged flip cap optic cover makes it a snap to keep fine optics protected and flips completely back so the cap lies flat. Simply slip the rubber cover over the objective or ocular end of your optic. Specifications: Weight 6.7 oz Outside Diameter (inches) 1.6 - 1.8 inches Outside Diameter (mm) 40 - 46 mm
