The German firm of Simon Nann GmbH&Co.KG, in Böttingen, lists the following information for their "System Deckel (for engraving machines)" collets:
|Nann Article Number||Max. Diameter (mm)||Overall Length (mm)||Taper Angle (degrees)||Max. Capacity (mm)|
Source: Standard Clamping Devices, http://www.nann.de/uploads/cms_links/00000192_l_NAN007_KA-CT49E-Standard.pdf, p. 136 (p. 60 of the PDF).
Measurement of a collet which came with my Deckel GK 21 gives an overall length of 23.99 and a maximum diameter of 17.37. This would indicate that the GK 21 takes a Nann article numer 405 E. I don't know what the corresponding Deckel designation of this collet size would be.
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