Description PRODUCT DETAIL:Virtually indestructible, the Defender flip caps are the most versatile and durable on the market, these are the last flip caps you'll ever need. Made in the USA. A stainless steel spring flips the Eyepiece into multiple stop positions: vertical, 45 degrees and 90 degrees. The vertical position is for inserting your dope disk in to have easy access to while shooting. Dope disk NOT included. The E-10 fits all Vortex Riflescopes EXCEPT the 1-inch tube Viper model VPR-M-01BDC, VPR-M-04BDC and VPR-M-03BDC. Outside diameter: 41.5-46 mm | 1.6-1.8 inches A stainless steel spring flips the O-24 cap into multiple stop positions at 45 and 90 degrees. Outside diameter: 28.25-31.25 mm | 1.1-1.2 inches Objective-24 fits: RZR-16003, RZR-16004, RZR-16005, PST-14ST-M, PST-14ST-A, PST-43111, PST-1605, PST-1607, SE-1624-1, SE-1824-1, CF2-31035, CF2-31037, CF2-31047