Aimpoint TwistMount Ring and Base complete. This Aimpoint Ring and Base Complete include two Pieces that allows rapid transition from 1 x to 3 x. The Aimpoint TwistMount's base stays on the rail. This Aimpoint Red Dot Sight Accessory is made by precision anodized aluminum and steel construction. AimPoint TwistMount Ring and Base fits Picatinny rail. This red dot sight accessory boasts the same Aimpoint quality as we have come to expect from Aimpoint Red Dot Sights. This Aimpoint Red Dot Sight Accessory is made to work with the Aimpoint Red Dot Scopes. Specifications for Aimpoint Twist Mount Ring and Base for 3x Magnifier 12234: Manufacturer: Aimpoint Red Dot Sights-Footprint: Not Applicable Optic Cut: Not Applicable Condition: New Package Contents: AimPoint TwistMount Satin Black Ring and Base complete 12234 Aimpoint TwistMount Ring and Base complete