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#6-20 x 1/2" Pan HD Self Drill Screw (Sq. Dr) 
#6-20 x 1/2" HWHD Self Drill Screw #8-18 x 1/2" HWHD Self Drill Screw #8-18 x 1/2" Pan HD (Sq. Dr) Self Drill Screw #10-16 x 1/2" HWHD Self Drill Screw #10-16 x 1/2" Pan HD Self Drill Screw (Sq. Dr) 
Self Drill