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the largest variety and highest quality standard Collet Chucks. ER, TG and DA Collet Chucks on BTDVCAT & HSK tapers Metric & in Metric & Inch version available. Straight shank extensions are available as well. ER collet chucks guarantee run out accuracy of 0.005 mm or 0.00002” w.r.t.Taper. TG & DA Collet chucks guarantee run out accuracy of 0.008 mm or 0.0003” w.r.t .Taper. ER Lock nuts are supplied with special surface treatment to the improve wear resistance & reduce the friction. Pre-balanced collet chucks are supplied in balancing grades G6.3 or G2.5 on request.