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.The distance between the two holes or between holes with outer edge should be twice the thickness of a product or two times the size of the largest measured the circumference of the hole.
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