If variable speed is not present, there should be at least two speed settings so you can cope with different jobs, and a reverse setting so you can remove screws.
Some models right at the top of the market now have nickel-metal-hydride (NiMH) batteries, which carry a longer charge and are more environmentally friendly.
Ensure power tools are used with the correct shield, guard, or attachments, recommended by the manufacturer.
Do not attempt to service machine unless qualified to do so.
Keyless chucks are easier, because there's less fiddling involved.
Verify rotating or moving parts of equipment are guarded to prevent physical contact.
Harder materials and larger bits require working at a lower speed.
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