TufForce Dovetail Rail to Picatinny/Weaver Rail Adaptor for .22 Airgun or Marlin Model 60, USA Patent Granted Tufforce low profile .22 air gun Dovetail to Picatinny/Weaver Rail adapter, fit .22 rail width 11.0-12.5 mm low profile: 8mm / 1/3", convert .22 air gun rail into weaver / Picatinny rail mount base tightened by two 4x15 screws and two M3 pins in vertical direction The distance between two screws is 95 mm / 3.8", 8 slots, 4 on each side separated by bolts