Abstract: A rafter square is provided with a triangular base plate, having a flanged base edge portion, a side edge portion, and a hypotenuse edge portion. An extension arm is selectively movable from a retracted position, closely adjacent the hypotenuse edge, to an extended position that is in-line with, but extends beyond a distal end of the side edge. Various locking mechanisms are provided for selectively locking the extension arm in either or both of its retracted or extended positions.

Abstract: A hammer includes an elongated handle having a top end and a bottom end and a hammer head mounted on the top end of said handle, the hammer head including a body section and a rigid nail striking head section having a nail striking face. A nail pulling device is mounted on the handle, the nail pulling device having a nail-engaging plate and at least one generally keyhole-shaped slot formed therein, the slot including an access opening having a relatively wide transverse dimension sized to receive a nail head therethrough and a narrowed groove section having a transverse dimension smaller than the transverse dimension of the access opening and sized to inhibit passage of a nail head therethrough, the nail pulling device operating such that the head of a nail to be pulled is moved through the access opening of the slot and the hammer is positioned to secure the nail in the groove section.