For a dovetail rail for TRG 30mm ring size 7MIL/24MOA Height: 35mm/1.38" Length: 126mm/4.96" This scopemount system was mounted on the rifle, but never had a scope in it. Sold the gun the new owner didn't think he needed this mount. Spuhr mounts are top of the line. I paid $410 plus shipping looking to sell for $275 shipped, open to offers or trades. PM me if interested.