An L shaped versatile, combination construction square for a carpenter having measured marks for all common framing combinations about its six sides. A series of template openings, as well as two adjustable base arms able to set angles for setting plumb, lock into a position to cut rafter tails and birds mouths as well as stair treads and risers. It has a precise scale that accommodates a traditional carpenter's rectangular 3/16 inch wide pencil lead that allows for inch increments that can be transferred the length of a board using the adjustable arms. It also functions as a framing square and a laser angle finder.

An L shaped versatile, combination construction square for a carpenter having measured marks for all common framing combinations about its six sides. A series of template openings, as well as two adjustable base arms able to set angles for setting plumb, lock into a position to cut rafter tails and birds mouths as well as stair treads and risers. It has a precise scale that accommodates a traditional carpenter's rectangular 3/16 inch wide pencil lead that allows for inch increments that can be transferred the length of a board using the adjustable arms. It also functions as a framing square and a laser angle finder.

An angle measurement tool includes first and second elongate members, one of the first and second longitudinal members having an aperture defined by an inner circumference shaped as an outer circumference of an eight-pointed star polygon, the other one to the first and second elongate members having a fixing means adapted for engagement in the aperture of the first elongate member so as to fix the first and second elongate members at a predetermined angle relative to each other.

An angle measurement tool includes first and second elongate members, one of the first and second longitudinal members having an aperture defined by an inner circumference shaped as an outer circumference of an eight-pointed star polygon, the other one to the first and second elongate members having a fixing means adapted for engagement in the aperture of the first elongate member so as to fix the first and second elongate members at a predetermined angle relative to each other.

An adjustable carpenters square has a handle and first and second blades extending from the handle in a substantially perpendicular relationship. The first blade is fixed in the handle and the second blade is pivotally mounted on the handle to enable it to be adjustable with respect to the fixed first blade to ensure that it is at a true 90 to the first blade. A cam mechanism is mounted in the handle and engageable with the second blade to pivot the second blade with respect to the first blade. The cam mechanism includes a one-piece cam having a cylindrical base and a cam portion offset therefrom. This cam mechanism enables the method of the present invention of adjusting the perpendicular relationship between the two blades to be achieved with a high degree of accuracy.

An angle indicating instrument which, used in conjunction with a sliding T-Bevel, can indicate to users what miter saw setting to use when cutting two pieces of material for a miter joint, or for cutting one piece of material requiring a miter cut.

The adjustable laser line, level, and square is a leveling tool. The adjustable laser line, level, and square comprises a pedestal, a slewing bearing, a stanchion, a drafting triangle, and a laser. The laser and the drafting triangle are attached to the stanchion. The slewing bearing attaches the stanchion to the pedestal. The laser generates a straight beam of light that is used to form a straight line along the surface. The adjustable laser line, level, and square allows for the adjustment of both the azimuth angle and the polar angle of the laser. The slewing bearing is used to adjust the azimuth angle. The drafting triangle is used to adjust the polar angle. The stanchion further comprises a plurality of bubble levels that measure the angle of the stanchion relative to the force of gravity.

The adjustable laser line, level, and square is a leveling tool. The adjustable laser line, level, and square comprises a pedestal, a slewing bearing, a stanchion, a drafting triangle, and a laser. The laser and the drafting triangle are attached to the stanchion. The slewing bearing attaches the stanchion to the pedestal. The laser generates a straight beam of light that is used to form a straight line along the surface. The adjustable laser line, level, and square allows for the adjustment of both the azimuth angle and the polar angle of the laser. The slewing bearing is used to adjust the azimuth angle. The drafting triangle is used to adjust the polar angle. The stanchion further comprises a plurality of bubble levels that measure the angle of the stanchion relative to the force of gravity.

An angle indicating instrument which, used in conjunction with a sliding T-Bevel, can indicate to users what miter saw setting to use when cutting two pieces of material for a miter joint, or for cutting one piece of material requiring a miter cut.

A carpenter square includes a body including a first, second, and third edges. A fence is pivoted to the first edge for movement among first, second, and third positions. In the first and second positions, the fence is normal to the body. In the third position, the fence is coplanar to the body. A hinge assembly pivots the fence to the body and includes a notch in the body, a recess in the notch, and a tab projecting from the fence and fit over the pin for reciprocating and swinging movement. The tab moves between a neutral stance, in which the tab is mis-registered with the recess and disables movement of the fence among the first, second, and third positions, and an advanced stance, in which the tab is registered with the recess and enables movement of the fence among the first, second, and third positions.