Specification: Material: Three sharp woodworking drill high-speed steel 4241, in the middle chamfering drill body is 45 steel Three-point drill diameter: 3 mm x 60 mm (length) 4 mm x 75 mm (length) 5 mm x 85 mm (length) 6 mm x 93 mm (length) Chamfer diameter: 15.8 mm Feature: Special designed steel counter sleeve countersinks or counter bores pilot hole. Adjustable counter sleeve depth with wrench. Drill and countersink for wood screws without changing bits. Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew. Chamfer is 5 flutes,In the process of using, can discharge the wood more rapid, sink hole disposable drilled smooth, screw cap perfect embedded in the surface of workpiece. Benefits: In many cases of woodworking projects, it's vital for appearance, safety and everyday use that the screw heads be perfectly level with, or even below, the surface of the lumber. The solution for these kinds of projects is to countersink your screws. In the old way of countersinking, you need to select a drill bit that is the same diameter as the shafts of your screws, and a second drill bit that is the same diameter as the heads of your screws. It’s also tricky to control the depth of the holes. With this Migiwata 2-in-1 countersink drill bits set, the job will be quite easy. One bit can finish drilling and countersinking for wood screws. Drilling depth can be adjusted for various screws simply by loosening and tightening the setscrew with an Allen wrench. Package included: 4 x Woodworking chamfer 1 x Hex key
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