The BKL-257H is an economical mount for 1" scope tubes. It was designed for the shooter who wants stability and prefers 2 piece independent rings. The 275H is .2" taller than standard Model 257.
I bought this for my Hatsan since to buy seperate tins would be so expensive to find the perfect pellet and THIS gave a GREAT VARIETY and I found the pellet I shoot best here .