I used them for a small electronic tree project. They are accurate and I haven't had a cross thread yet. They mate perfectly with the countersink set so that the screw heads are flush with the surface they are screwed into. I used this bit set with the smallest bit. It takes a little effort to get the depth of the drill right because these screws are so tiny. Drill and tool Century 37405 countersink 5 pcs. Furnished
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