Compared with traditional designing for long size of drill length such as number 5, 6, 7, 8, 9, 10, this latest innovation could replaced the functions of penetration for point number 5, to 8, it’s mean the thickness of steel plate from 6.mm up to 20.mm will be just penetrated by one size of screw only. This great revolution would much save a lot space for storage and inventory control. Base on that conditions we strive for more inquiry on heavy duty field and expanding the consumption to a high level as well.
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