The BKL Tri-Mount Dovetail Riser Mount is packaged as a set. The Length of these riser blocks matches BKL models 263 (1" Long Double Strap Dovetail Rings) and 301 (1" Long Double Strap Dovetail Rings). The additional .68" in height gives the target shooter a more heads up shooting position. New design allows for additional dovetail mounting points on each side. Available in Matte Black and Silver. Features2 Sets of Dovetail Mounting Points of Different Size