Check the listing for details. Vortex Defender Flip Cap Eyepiece 40-46mm E-10 *E & W CHART NOT INCLUDED*. Condition: New. Listed at 24.00 USD. 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. Rifle ranges the world over are littered with broken flip caps. This is one cap you will most likely never see in a flip cap boneyard. The E-10 cap has three stop positions. The first vertical, to put your dope disk (optional accessory) literally right in your face. The second at a 45° and the third at 90° to lay flat back. 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: 40-46 mm | 1.57-1.81 inches This item comes backed with the Vortex Optics Lifetime Warranty. Free first class mail shipping! Elevation and Windage chart not included