Micron Milling Chucks by Showa Tool guarantee tolerances as tight as 1µm at the chuck nose and 2µm at 3xD. ERI-America stocks Showa Toolµm Milling andµm Mold chucks in CV40/50, BT40, HSK63A, HSK100A and BIG Plus. ERI America is the exclusive distributor of Showa Tool, including theµm Milling andµm Mold Chucks in North America.