
I have only used full arms and only in fairly thin sheet metal [sectional garage doors], but I am very satisfied. The screws are very even and well made. If you use a [3/8 inch] hex screwdriver with a magnet, it will hold the head of the screw. The screws are boxed but not marked for retail [perhaps repackaged by a wholesaler?]. They are easy to drill with no problems. And they fit perfectly for a secure fit. But I haven't used them in materials thicker than 1/8" so I don't know how these screws will drill/hold in more extreme use. In general, they're great for projects that involve... Experience - Sheet Metal. good value

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