DNZ Browning X-Bolt Long Action Rings/Base Combo - 1 piece - Matte Black - machined 1-piece ring & mount. Eliminates misaligned scope rings & scope damage. Bolts easily to all 4 holes on firearm. Rigid design-no moveable parts between firearm & scope. Extra lightweight super strong. Aligns with receiver for more pleasing look. No extrusions. Includes socket head cap screws. Custom made to fit each type firearm. Anodized finish will not rust. No lapping.