11 slotumbrella head Screws1.Color :white 2.Material : Iron ,SS304, carbon steel..3.Size: #6--3/4"(M3-M10), as drawings or samples.4.Standard:GB, DIN,ANSI, as customers' drawings and demands5.Surface: zinc ,clolor zinc.. Brass, Black Zinc,White Nickel ,black nickel,Milling Oil,finish as...