Centaur Precision Tools TG Rigid Tap Collets can be utilized for synchronous tapping operations using any TG collet chuck. The collet bore is exact tool diameter, with square drive, for accuracy and rigidity. All Centaur TG rigid tap collets are manufactured from high-grade spring steel, hardened and ground with 100% quality inspection.Centaur Precision TG Rigid Tap Collets conform to DIN6341.