Wettstein Tool™ 4.000" diameter 5C expanding collets deliver exceptional precision, concentricity, and gripping performance for high-accuracy internal work holding applications. Manufactured by Wettstein Tool™, these expanding collets are engineered for tight tolerances, consistent expansion, and long service life in CNC lathes and secondary operations. Ideal for holding bored or finished IDs, they provide superior repeatability while minimizing part distortion. Built from premium materials sourced in the U.S.A. and expertly ground, Wettstein Tool™ 5C expanding collets help maximize machining efficiency, surface finish quality, and overall productivity.