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8 x 2 1/4 Phillips Flat w/ Nibs Self Drilling Cement Board Screws w/ Wings Ruspert Coated - Carton (3000) M20-2.50 Hex Cap Screws DIN 933 18-8 Stainless Steel (A2) 5/16 x 7 Square Pan8 x 2 1 4 Phillips Flat w Nibs Self Drilling Cement Board Screws w Wings Ruspert Coated Carton (3000) . Meets F. I. P. 1000. 7 for torsional strength and drill speed Ceramic coating provides protection from corrosion Wings ream hole in board preventing "jacking action" Nibs under head clamp board firmly