Drill bit tester

The tester is used to check the quality of the drill bit shank. Simply insert the drill bit into the tester hole and twist it in any direction. If you encounter resistance from the shank, it is imperative that you replace the drill bit with a new one. A crooked drill bit is responsible for heating up the nail shaper pen and damaging the nail shaper collet. The cost of repairing the nail shaper exceeds many times the value of buying a new shaper, so we should systematically check the drill bits to make sure they are fit for further use.