The chuck itself is stable and solid. It is intended as a quick chuck without key. However, it is difficult to tighten by hand, so that the drill quickly tends to slip. The chuck is in a small cordless drill not screwed, but yes only plugged. It's a wobbly affair. Going back to the drill from the hole, then slide the quick chuck from the plug feed of the cordless screwdriver. Better to use the same drill with a keyless chuck. Small cordless screwdriver screws are just not meant to be boring but to.
