ISO 4202:2016 specifies the dimensions of reduction sleeves with external 7/24 taper (Nos. 30, 40, 45, 50 and 60) for tools with Morse taper shanks (Nos. 1 to 6).

All these sleeves allow driving of tools having Morse taper shanks which have a tenon at the small end of the shank; some sleeves allow driving of tools having Morse taper shanks which have an axially tapped hole in the shank:

- with the use of an incorporated screw for sleeves 30 x 1 - 40 x 1 - 40 x 2 - 45 x 1 - 45 x 2 - 45 x 3 - 50 x 2 - 50 x 3 - 50 x 4 - 60 x 3 - 60 x 4 - 60 x 5;

- with the use of a draw bar for sleeves 30 x 1 - 30 x 2 - 40 x 1 - 40 x 2 - 40 x 3 - 45 x 1 - 45 x 2 - 45 x 3 - 45 x 4 - 50 x 2 - 50 x 3 - 50 x 4 - 50 x 5 - 60 x 3 - 60 x 4 - 60 x 5 - 60 x 6.

Morse tapers conform to ISO 296 while 7/24 tapers are in accordance with ISO 297.