A bevel gauge is an adjustable gauge for setting and transferring angles. The handle is usually made of wood or plastic or steel and is connected to a metal blade with a thumb screw or wing nut. The blade pivots and can be locked at any angle by loosening or tightening the thumb screw. Gauge is mainly used to measure of angle of valve face, valve seat. The straight edge is used to check the distortion of plain surfaces like cylinder head, cylinder block.
