Use appropriate safety glasses, face shields, etc. while using hand tools or equipment that might produce flying materials or be subject to breakage.
Harder materials and larger bits require working at a lower speed.
Keyless chucks are easier, because there's less fiddling involved.
Check that speed of abrasive wheel is compatible with the machine speed.
Ensure power tools are used with the correct shield, guard, or attachments, recommended by the manufacturer.
Proper, effective hearing protection should be worn when working with noisy tools such as power hammers and breaking tools.
Make sure all cord-connected, electrically operated tools and equipment are effectively grounded or of the approved double insulated type.
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