1-2-3 setup blocks are used to raise workpieces a prescribed distance off of a machine table or other surfaces. These blocks are most commonly 1” x 2” x 3” but also available in 2" x 4" x 6" and ensure accurate angles and spacing when inspecting or working on items. Most blocks have tapped holes for clamping and bolting applications. These blocks take up little space and are commonly used for inspection and layout applications.