PMD Products Flooring Jack for Installing, Straightening Laminate or Hardwood Wood Tile Floor boards Hand Free Nailing of Hardwood Flooring. Can be used with any floor thickness Makes installing hardwood floors easier. Won't damage the flooring Always have straight floorboards by bringing crooked planks into place for nailing Steel Jack, Hardened Gear, spring loaded ratchet mechanism for locking Can be used as push or pull designed to push or pull flooring strips into place