Evolution Gun Works Universal Leupold DeltaPoint Pro Sight Mount JPoint Redfield Accelerator and Optima .468in Radius 1.604in Aluminum Matte Black. 604"Overall Width: .99"Overall Height: .335"Radius: .468"Mounting Hardware: (2) 6-32 Button Head Screws (2) 6-48 Torx Head ScrewsRed Dot Fitment:Leupold DeltaPoint Pro JPoint Shield RMS/RMSc/SMS Redfield Accelerator OptimaThis mount has a bottom radius of .468". There should be a slight gap at the top of the radius between the receiver and the mount when mounted. The two spreads on this mount measure .500"-.505" and .8625".This should fit barrel/receiver diameters from .936"-1.350". Specifications for Evolution Gun Works Universal Leupold DeltaPoint Pro Sight Mount JPoint Redfield Accelerator and Optima: Manufacturer: Evolution Gun Works Color: Black Finish: Matte Gun Model: Universal Fabric/Material: Aluminum Red Dot Sights-Footprint: Deltapoint Pro Optic Cut: Not Applicable Length: 1.604 in Package Contents: Evolution Gun Works Universal Leupold DeltaPoint Pro Sight Mount JPoint Redfield Accelerator and Optima Evolution Gun Works 49425: Universal Leupold DeltaPoint Pro fits JPoint Redfield Accelerator and Optima Mount .468 in Radius 1.604 in Aluminum Matte Black Hardcoat