Wrenches should be inspected before use to be sure they are not cracked, bent, or damaged. They should be cleaned after use.
Always use the correct size of wrench for the fastener being loosened or tightened to prevent the rounding of the fastener.
When attempting to loosen a fastener, pull—do not push— a wrench. If a wrench is pushed, your knuckles can be hurt when forced into another object if the fastener breaks loose.
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