A canonical hole that may be bored to the leading of the screw hole for the objective of permitting the screw to take a seat flush with or beneath the floor of the material it’s staying driven into Thread forming screws are just like thread cutting screws, but instead of https://woodscrews71112.blogunteer.com/27913731/how-much-you-need-to-expect-you-ll-pay-for-a-good-screws