Slip Gates, also known as Stang Stoops, Yatsteads or Stang Pole Gateways are a form of simple gate that once commonly in Europe controlled access to fields, lanes, etc. using removable cross-bars and two fixed posts, often of stone. The usually wood spars or stangs were slotted into grooves cut into the stone piers and held firmly in place at one end with wedges and on the other end by being placed in a deep square or circular socket. Most other gates are formed of a fuller frame; many instead have hinges.