countersunk self drilling screws and drilling tail screw the tail of the screw is drilling tail or pointed tail, without auxiliary processing can be directly on the setting material, basic material drilling, tapping, locking, can greatly save the construction time. Compared with ordinary screws, its tough pulling force and high maintenance force combination after a long time will not loosen the use of safety. Especially in the combination of construction, construction, residential and other places, and the operability, cost to credibility of self-tapping self-drilling screws for the best economic fasteners.
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