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Feeler gauges or ½” shims are precision tools used to measure the tight clearance between parts. They are composed of folding metal strips, leaves, or blades of varying thicknesses that are fitted in gaps to take measurements. They are generally used in spaces wherein a caliper or tape measure will not be able to fit. Feeler gauges may be used to check spacings and gaps in machinery during set up or repair or for measuring critical clearances in product assembly.