Each Weaver base is machined to the tightest tolerances for a custom fit. They are designed to fight the effects of recoil with a square-cut notch that precisely mates to the sturdy cross bolt in every Weaver detachable ring. 

Features and Specifications:
Manufacturer Number:48426 
Weaver 
No. 414M Remington 597 Standard One Piece Detachable Base
Top Mount 
Matte Black 
Includes custom hardened fastening screws for mounting