These drill bits are the worst purchase I have ever made on Amazon they are complete rubbish. I have never known a drill bit just bend when put against wood. I removed the bit and was able to bend it in my fingers. I gave one of the drill bits to my 10 year old son and he was able to bend it in half and we are talking about a 3mm drill bit. I am going to contact Silverline direct and see what they suggest. so once again please think twice about buying these I have bought a set of drill bits by Draper and so far one drill bit has out lasted 6 from this set.
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