The depth of the hole should not exceed 3 times the diameter, if smaller diameter holes 5 mm (approx 3/16 inches), depth of the hole should be twice the recommended thickness, diameter of the bottom of the hole should be equal to 0.2 times the diameter of the hole to eliminate disability for the opposite side.A good design is the thickness of the hole evenly and does not always have the best corner next to where the focus of the application.
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