Spacers have a screw thread that can be screwed to adjust the height from 5 to 100 mm or 5 to 100 mm above the reference surface. The smallest height adjustment is 1 mm. The sizes are etched on the surface of each spacer for quick identification. They fit all system bores and are self-locking with o-ring. The top surface has a M10 or M8 tapped hole for mounting customer specific components or V-blocks. The set includes 11 pieces, with dimensions of 1, 2, 2.5, 3, 4, 5, 10, 20, 40, and 175 mm length.