Pour melted on to bottom of a 9 x 13 x 2 cake pan. Sprinkle graham cracker crumbs evenly over the butter. Sprinkle chopped nuts evenly over the top of the graham cracker crumbs. Scatter chocolate bits over the chopped nuts. Sprinkle the coconut evenly over the chocolate bits. Pour the can of milk evenly over the top of everything. Bake at 350 degrees for 25 minutes until top is lightly browned. Remove from oven. Allow to cool for 15 minutes. Cut into bars.