RTS Rigid Tapping Collets with Square Drive For synchronous tapping operations using any ER collet chuck. Collet bore is exact tool diameter, with square drive, for accuracy and rigidity. Available sealed for coolant-through applications, as well as in DIN and JIS standard metric sizes. Lexis RTS Collets available upon request. Please provide diameter and square dimensions required. Tapping Collet Lexis Collet