SOSS Mortise Mount Invisible Hinges with 4 Holes, Zinc, Black E-Coated Finish, 1-11/16" Leaf Height, 3/8" Leaf Width, 29/64" Leaf Thickness, 5 x 3/4" Screw Size (1 Pair) Soss invisible hinges for wood or metal applications Wood and machine screw With no. 53 soft wood and no. 57 hard wood pilot hole Zinc body with steel pins Black e-coated finish