An angle plate is a work holding device used as a fixture in metalworking.

The angle plate is made from high quality material (generally spheroidal cast iron

Cast iron

Cast iron is derived from pig iron, and while it usually refers to gray iron, it also identifies a large group of ferrous alloys which solidify with a eutectic. The color of a fractured surface can be used to identify an alloy. White cast iron is named after its white surface when fractured, due...

) that has been stabilized to prevent further movement or distortion. Slotted holes or T bolt slots are machined into the surfaces to enable the secure attachment or clamping of workpieces to the plate, and also of the plate to the worktable.

Angle plates also may be used to hold the workpiece square

Perpendicular

In geometry, two lines or planes are considered perpendicular to each other if they form congruent adjacent angles . The term may be used as a noun or adjective...

 to the table during marking out

Marking out

Marking out or layout is the process of transferring a design or pattern to a workpiece, as the first step in the manufacturing process...

 operations.

Adjustable angle plates are also available for workpieces that need to be inclined, usually towards a milling cutter

Milling cutter

Milling cutters are cutting tools typically used in milling machines or machining centres . They remove material by their movement within the machine or directly from the cutter's shape .-Features of a milling cutter:Milling cutters come in several shapes and many sizes...

.