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Extra long self drilling screws for steel, available in lengths up to 10"!   These #14 self drillers have 14 threads per inch and a #3 self drill point.  Zinc finish.
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Extra Length Self Drilling Screw 14 x 4" Extra Length Self Drilling Screw 14 x 5" Extra Length Self Drilling Screw 14 x 6"
Hex Self Drill Screw #14 x 4" self drilling screw box of 50. Zinc finish, 3/8" hex washer head. 14 threads per inch, fully threaded with a number 3 point. Hex Self Drill Screw #14 x 5" self drilling screw box of 50. Zinc finish, 3/8" hex washer head. 14 threads per inch, 3 inches of thread with a number 3 point. Hex Self Drill Screw #14 x 6" self drilling screw box of 25. Zinc finish, 3/8" hex washer head. 14 threads per inch, 4 inches of thread with a number 3 point.
Extra Length Self Drilling Screw 14 x 10"
Hex Self Drill Screw #14 x 10" self drilling screw box of 25. Zinc finish, 3/8" hex washer head. 14 threads per inch, 6 inches of thread with a number 3 point.