Strike Head and Mortise BladeStrike head and mortise blade of door latch installation tool work in tandem, remove material within the contour, with preset depths for fast, accurate, flush mounting. Door Latch Mortise Tool, Door Latch Installation Kit Help Remove Material to Install Door Latch for Clean, Accurate Professional Installation, Door Latch Tool for Use with 1-3/4″ or 1-3/8″ Thick Door.