Drilling machines with collet chuck

Collet

— a specific type of chuck used in miniature fine work machines that use appropriate drills. It acts similarly to the clip of an automatic pencil: the drill is held by flexible metal petals, which diverge when the cartridge is opened (usually by pulling the casing up). The collet mount allows you to quickly change drills, but is not suitable for more or less large nozzles, which led to its use.