Keyless chucks are easier, because there's less fiddling involved.
Make sure the portable fans are provided with full guards or screens having openings 1/2 inch or less.
Maintaining your tools increases their life.
Make sure all cord-connected, electrically operated tools and equipment are effectively grounded or of the approved double insulated type.
Get an extra battery pack when buying a drill so you won't have to wait for a battery to charge. Now the drill bit will stay where you want it to.
he chuck is the grip mechanism that holds the bit firmly. The chuck size limits the size of twist drill the chuck can hold. Most operate without a key these days.
Never carry a power tool by the power lead or hose.
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