An impact tool includes a tool-accessory holding part, a body and a first hammering member. The tool-accessory holding part has a through hole extending in a hammering-axis direction and is configured to hold the tool accessory inserted into the through hole to be movable in the hammering-axis direction. The body is connected to the tool-accessory holding part in the hammering-axis direction and has an internal space communicating with the through hole. The first hammering member is linearly movable in the hammering-axis direction and configured to drive the tool accessory in the hammering-axis direction by colliding with the tool accessory. The tool-accessory holding part and the body are connected in the hammering-axis direction via a first elastic element to be movable relative to each other. A second elastic element is interposed between the first hammering member and the body in a radial direction with respect to the hammering axis.

An impact tool includes a tool-accessory holding part, a body and a first hammering member. The tool-accessory holding part has a through hole extending in a hammering-axis direction and is configured to hold the tool accessory inserted into the through hole to be movable in the hammering-axis direction. The body is connected to the tool-accessory holding part in the hammering-axis direction and has an internal space communicating with the through hole. The first hammering member is linearly movable in the hammering-axis direction and configured to drive the tool accessory in the hammering-axis direction by colliding with the tool accessory. The tool-accessory holding part and the body are connected in the hammering-axis direction via a first elastic element to be movable relative to each other. A second elastic element is interposed between the first hammering member and the body in a radial direction with respect to the hammering axis.

A hammer is provided having two faces, capable of producing a very wide variety of patterns. One face has a single dome centered in an otherwise un-textured field having a slight curvature, which eases the metalworker's ability to apply only the desired design of a single dome. The dome has an ellipsoidal surface with a diameter at its base of to about and a height of from about 3/16- 5/16. The very tip of the ellipsoid has a radius of curvature from about 0.010-0.015 while the radius of curvature adjacent the intersection with the body is from about 0.035 to 0.070. The other face has a similar gently curved field with 3 parallel upraised trapezoidal ridges formed therein, the central ridge having a height between about 0.014-0.020, the two exterior ridges having a height between about 0.009-0.011, the central face of all three ridges having a width of about 0.010, and the included angle between the central face and the inclined sidewalls being about 120.

A plumb bob assembly includes a vertical bar that includes an upper end and a lower end. The plumb bob assembly further includes a plumb bob coupled to the lower end of the vertical bar. The plumb bob assembly further includes a cross plate coupled to the vertical bar. The cross plate is located near the upper end and extends perpendicularly across the vertical bar. The cross plate includes a front end and a back end. The plumb bob assembly also includes a pair of horizontal reference plates. Each horizontal reference plate includes a reference end, each of the reference ends are configured to align with the front end or the back end of the cross plate.