Constructed of durable, hard-coat anodized aircraft aluminum, the Leupold Dual Dovetail Mount Bases provide a classic low-profile mount for bolt-action rifles, resulting in rock-solid, tack-driving accuracy. Designed specifically to be used with Dual Dovetail (DD) rings (not included), both front and rear bases feature a dovetail style design for solid and simple mounting security. Aircraft aluminum construction Hard-coat anodized Low-profile design Designed specifically to be used with Dual Dovetail (DD) rings (not included)