DON'T SPEND MONEY, THIS IS BOOM AND UNSAFE! I bought 1 carpentry kit, it has 2 1/4" bits, one was great, one fell out of the bit when I was using it, one good bit is 1/4 and the other isn't, it's 1/4 printed on it.on the outside of the bit but measured quite smaller and it can't be returned!I've definitely learned my lesson STICK BY BUYING MY TOOLS AND BITS FROM LOWE'S OR HOME LAGER!DO YOURSELF A FAvor AND SAVE MONEY AND THAT'S WHAT I SHOULD DO NOW GO BUY ONE FOR $50 AND I HAVE THE $30 I PAID FOR IT FROM HUM!