Mine came with the drill chuck, the key for the chuck, and the stub shaft. It is a tapered fit to the chuck so in order for it to stay together I froze the stub shaft and warmed the chuck up to about 150-180⁰ farenheight. When I put them together I clamped it in a vise until the temperatures equalized. So far I have not had them come apart. Even drilling up to inch holes.
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