You may wish to consider renting a magnetic clamp drill or a clamp for your existing drill. Use is self explanatory. You can look at the bit from all angles before you start. It won't move around or get tired. You can focus on the pressure you are using and have a hand free to lubricate the bit.

• Retrieve dropped items.

• Test for filler in bodywork.

• Illuminate awkward spots (LED version).

• Consider the versions with LEDs.

• Look for exchangeable heads.

• Check how much weight it lifts.

• May not be suitable if you wear a pacemaker.