<b>Worry-free after-sale service: </b> <br>--Lifetime warranty and money back guarantee. <br>--Unconditional replacement or full refund for defective product. <br>--Please feel free to contact us by emails for solution if there are any problems. <br><br><b>Warm Tips: </b> <br>--Suitable for most general purpose,don't use impact mode of drill or hammers. <br>--When drilling hard material (glass, porcelain floor tile, marble or granite), please use water for lubrication. <br><br><b>Package Included: </b> <br>--1/8" (3 INCH LENGTH - 2 INCLUDED)， <br>--1/4" (4" LENGTH - 2 INCLUDED)， <br>--1/4" (6" LENGTH - 2 INCLUDED), <br>-- 5/16 (6" LENGTH), <br>-- 3/8" (6" LENGTH - 2 INCLUDED), <br>-- 1/2" (6" LENGTH).