10-24 x 1-1/4" Carriage Bolts, Round Head, Square Neck, Stainless Steel 18-8, Full Thread, Plain Finish, Flat Point, Quantity 50 By Fastenere Thread Diameter 0.190" Head Diameter 0.469" Head Height 0.114" Square Neck Height 0.125" / Square Neck Width 0.20" 18-8 Stainless Steel provides strength and offers good corrosion resistance in many environments.