birla precision offers the largest variety and highest quality standard collet chucks. er, tg and da collet chucks on bt/dv/cat & hsk tapers metric & metric & ch 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.