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The selection criteria for drywall nails are that the head should have a round cross groove located in the center of the round head, and the tip should be pointed. The tip of the drywall nail is generally required to be between 22-26 degrees, and the head tip should be full without dragging or cracking. This "tip" is the most important for drywall nails. According to national standards, wall nails should be able to drill through 6MM of iron plate in 1 second