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self drilling screw with wings
For assembling wood on metal, a hole in the wood is required with some space to avoid threading, the wood before the drill in the strip is finished, The Self-Drilling point drills steel whilst the wing tips create a pilot hole braking off when passing through the steel,Otherwise the drill tip could be burned, the wood,broken or the fixing wood-strip unglued. Application 1:Both wings avoid the wood to be damaged by drilling a pilot hole. With ribs under the head that countersunk the wood ...
