These are handy for layout and machine set-up, because the movable stop provides a reliable reference point. You can use them to locate saw fences, plot the position of hardware mounting holes, set the height of a saw blade or router bit, and draw lines parallel to any flat surface. The stop face is 2" wide for solid registration, and the ruler tip is 7/32" thick to provide a broad land when using the tool as a height gauge. Graduated in Imperial/metric. Each scale has a vernier for adjustment to within 1/128" or 0.1mm without parallax error. Made from chromed steel with a non-glare matte finish, each rule has clear etched and black-filled markings and a knurled locking knob.