Simpson HWDC3.37-KT25 Head-Of-Wall Drift-Clip Connector, Pkg 25The Simpson Strong Tie head of wall drift clip connector (HWDC) is used to secure the head of a wall to the bottom of a slab or beam. The unique design allows anchor screws to be installed closer to the bend, providing a stronger and stiffer connection while also allowing horizontal and vertical movement during seismic and high wind events. HWDC connectors are an optimal solution for adding strength to window or door jambs at head of wall connections