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, VPR-M-03BDC and Viper HS 4-16x44 model
VHS-4305 and VHS-4304.
Outside diameter: 41.5-46 mm | 1.6-1.8 inches