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+1 (217) 579-8045ROYAL 53106 COLLET ER-25 5/16" Extremely accurate - runout is guaranteed to be 6 microns (.2 in) T.I.R. or better Heavy duty construction- Royal ER collets are made from high grade steels imported from Germany and are hardened for long life Optimizes the surface contact between the collet and cutting tool and results in higher accuracies, stronger grip force, better part finishes and longer cutting tool life Wide gripping range - Royal standard ER collets contain 16 slots providing a larger gripping range than other brands