There's nothing particularly notable about these beats, but they seem to be well made and do the job. Like the other reviewer, I lost a set screw on a bit when it came out and disappeared while milling. ONLY as a concealed fitting are they really best suited. I slipped them in as pattern fasteners to route the pictured 3 tier sewing table (12mm, 18mm and cut through first) but it wasn't fun! They don't dive very well (not that they claim to) and they definitely work better when they're clean than when they're at the bottom. Attractively priced! They went on smoothly. No problem with carbide or shafts. 4 stars for good basic quality.
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