Assemblies, circuit boards or inserts specially designed for machine tools controlled in this annex: a. Spindle assemblies, consisting of spindles and bearings as a minimal assembly, with radial (‘run-out’) or axial (‘camming’) axis motion in one revolution of the spindle less (better) than 0,0006 mm total indicator reading (TIR); b. Single point diamond cutting tool inserts, having all of the following characteristics: 1. Flawless and chip-free cutting edge when magnified 400 times in any direction; 2. Cutting radius from 0,1 to 5 mm inclusive; and 3. Cutting radius out-of-roundness less (better) than 0,002 mm TIR. c. Specially designed printed circuit boards with mounted components capable of upgrading, according to the manufacturer’s specifications, ‘numerical control’ units, machine tools or feed-back devices to or above the levels specified in this Annex. Technical Note: This entry does not control measuring interferometer systems, without closed or open loop feedback, containing a laser to measure slide movement errors of machine-tools, dimensional inspection machines or similar equipment.