E-10 Vortex Optics Defender Flip Cap Eyepiece This is the last flip cap you will ever need! Virtually indestructible, this cap will fit snugly on nearly all Vortex Optics and features a snap flat spring that will keep your line of sight unobstructed. The E-10 fits all Vortex Riflescopes except the 1-inch tube Viper model VPR-M-01BDC, VPR-M-04BDC and VPR-M-03BDC. Specifications: Outside Diameter (inches) 1.6-1.8 inches Outside Diameter (mm) 41.5-46 mm
