Evolution Gun Works Keystone Series 34mm Tube 1.50in High Ring Set Black. Choosing the right scope rings can be tough but we made it easy with our Keystone 34mm scope rings. They fit both picatinny and weaver rails and are machined with a full cross bolt to give you the confidence you need when mounting your scope. These 1.5" High 34mm scope rings are made specifically for AR15 style rifles. We saw the need for a made in specialized factories mid-tier scope ring. One that was versatile robust AND also a great value. We werent happy with the current options on the market so we created our own. Introducing the Keystone Series scope rings. Specifications for Evolution Gun Works Keystone Series 34mm Tube 1.50in High Ring Set: Manufacturer: Evolution Gun Works Ring Height: 1.50 in Tube Diameter: 34 mm Fabric/Material: 6061 Aluminum Weight: 4.8 oz Color: Black Package Contents: Evolution Gun Works Keystone Series 34mm Tube 1.50in High Ring Set Evolution Gun Works 62202: Keystone Series 34mm Tube 1.50in High Ring Set Black