adjustable step drill for bolt

Hello.

I present my too step drill.

Turn and drill steel in round bloc and file the groove use air grinder tools.
And oil quenching.

finish manual sharpening.

For good result in mild steel with a slow rotation and abundant lubrication.

Thanks and sorry for my bad english.

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Thanks glockart! I've added your Two Step Drill Bit to our Metalworking and Machining categories, as well as to your builder page: glockart's Homemade Tools. Your receipt:

<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="/two-step-drill-bit"><img src="/uploads/74432/two-step-drill-bit.jpeg" alt="Two Step Drill Bit" /></a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="/two-step-drill-bit">Two Step Drill Bit</a> <span> by <a href="/builder/glockart">glockart</a></span> </div> <div class="tags"> tags: <a href="/tag/drill-bit">drill bit</a>, <a href="/tag/countersink">countersink</a> </div> </div> </div> </div>