QD Picatinny flat top 1&rdquo; 1inch high riser mount rail with multiple 14 ring slots and large clamping thumb screws Attaches to flat top Picatinny rails to raise line of sight by 1inch One piece body of skeleton see-thru design to reduce weight Sufficient mounting rail surface with 14 ring slots for most desired sight placement Locks firmly in place with two large thumb screws. Installs or uninstalls in seconds Top rail takes weaver or Picatinny style scope rings or mount