BSA 2 Piece 1" and 30mm tube Scope Mount is designed to fit 9.3mm to 11.5mm dovetails on .22 rifles and air guns. 
 
FEATURES
Grooved receivers
Made from the highest grade aircraft aluminium
Unique wrap around design to greatly reduce the danger of crush damage to scope tubes
Has over twice the clamping area of conventional mounts
Two screws for fixing to the rifle and two for the scope clamp 
 
SPECS
 Height : Medium
 Fit : 3/8" Dovetail, 1" diameter tube
 Gap: 1/2" between tube and top of rail