T-bevels are adjustable T-shaped tools that are used for setting and transferring angles in construction projects. T-bevels typically have a wooden or plastic handle with a metal blade at the top connected via a wing nut or thumbscrew. The blade adjusts and can be locked at a certain angle by tightening the connector screw. T-bevels are often used to recreate the angle of an existing object or are used alongside a protractor or framing square to set a new angle for measuring or cutting purposes. The simplest forms of T-bevels require the aid of an additional measuring tool like a protractor in order to set an exact angle, as there are no markings or aids that represent graduations. There are some digital T-bevels that incorporate electronic protractors into the device, which allow you to set the shape of the bevel and get a digital readout of the actual angle.