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# 10-9 X 3 1/2" Square Flat Head With Nibs Under Head Coarse Thread Type 17 Zinc Plated Screws
# 9-10 X 3" Square Flat Head With Nibs under Head Coarse Thread Type 17 Zinc Plated Screws (# 8 Head O.D.)
# 8-9 X 1 3/4" Square/Phillips Flat Head With Nibs Under Head Coarse Thread Double Type17 Zinc Plated Screws