	・	Stationary type collets are used for processing which wants to decide the axial direction of a workpiece correctly.
	・	There is no dispersal in the axial direction because the collet itself does not move. Therefore, it is used by the secondary processing which wants to decide the axial direction correctly.
	・	Stationary type collets can be used as tool holding collets with using the nose cap.

	・	Draw back type collets draw the collet itself and hold a workpiece using the screw of back portion. These collets are used for primary processing, such as NC lathe, in many cases.
	・	Draw back type collets can be expected high precision compared with stationary type collets. Moreover, rigidity is high.
	・	Positioning of the axial direction is not stabilized as compared with stationary type collets.

	・	Push type collets push the collet itself on the nose cap, and hold a workpiece. Therefore, the workpiece moves in the axial direction when it is held.
	・	High precision is not expectable since it is hard to take out concentricity with taper of the nose cap. However, it is effective to avoid interference with cutting tools.

	・	Tan line collets are mainly used for hobbing machine, such as Gleason (U.S. manufacture), and is indispensable to processing of differential gear of cars.
	・	These collets have the structure of clamping each part by two tapers and are suitable for clamping long workpiece.

Workholding collets (Outside diameter holding type)