I thought you would appreciate this, gleaned from the diyfaq.org.uk site: 3 for £1 long drill bits These bits are typically crude imitations of twist drills, and consist of a metal rod with a small piece of steel attached across the top. Scrape marks on the rod imitate a twist drill. Method of working is like a blunt flat bit, except that the flat tip wears away very quickly in use. These junk grade bits sometimes tempt diyers that only need to drill one hole, and assume the bits will do the task. Disappointment often ensues. Such bits are for all practical purposes non-performers. As an example, one hole in soft brick took around 8 regrinds just to drill the one hole, and the job was hard going and took nearly an hour. An SDS did the 2nd hole in under a minute, effortlessly. Ideal for drilling butter and soft cheeses.
Posted on: Mon, 05 Jan 2015 15:26:09 +0000
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