Hawkins Precision Heavy Tactical scope rings are the most robust rings you can buy for your precision rifle. They are made in the USA out of single billet 6061 aluminum and feature a six screw cap design for added reliability. The Heavy Tactical rings come standard with an offset anti-cant bubble level, top picatinny accessory rail, and a hard anodized finish. All heavy tactical scope rings come in 34mm diameter. Mfg: Hawkins Precision