The collets are necessary for the multi-functional precision lathe C6104.
The size of the borin .3mm-6.5mm with the graduations of 0.1mm,63 sizes in total.
The size of the borin .6mm 8mm with the graduations of 0.2mm,8 sizes in total.
The size of the borin mm 14mm with the graduations of 0.1mm,6 sizes in total.