Rego Fix Collets Set. 

Includes: 1-0.5mm, 2-1mm, 3-2.5mm, 3-2mm, 4-3mm, 5-4mm, 7-6mm, 8-7mm, 9-8mm. (6-5mm missing)

Long spindle: 125mm, 19mm diameter.

Short spindle: 50mm, 20mm diameter, M12 inner thread, hollow.