Preheat oven to 350ºF. In 9x13 inch pan, melt butter. Sprinkle graham cracker crumbs over butter. Spread evenly in pan. Pat securely down. Layer in order: Coconut, chocolate chips, and pecans. Patting down gently after each layer. Drizzle sweetened condensed milk over all. Bake at 350° for 30-40 minutes. Until deep golden color all over. Cool and cut into squares.