What is NEVER to be engaged when using power tools? booster ) bitshank trigger lock

## Step 1<br />The question is asking about the safety precautions to be taken when using power tools. The options provided are "booster", "bitshank", and "trigger lock". <br /><br />## Step 2<br />"Booster" is not a term commonly associated with power tools. It is more related to the field of electronics or physics, where it refers to a device that increases the amplitude of a signal.<br /><br />## Step 3<br />"Bitshank" is a term used in the context of power tools, specifically in the context of drill bits. It refers to the part of the drill bit that is in contact with the material being drilled.<br /><br />## Step 4<br />"Trigger lock" is a safety feature found on many power tools. It allows the user to lock the trigger in the "on" position, which can be dangerous as it can lead to accidental activation of the tool.