This Level 5 10" Flat Box has an adjustable crown dial that ensures the precise amount of mud. The variety of adjustment settings allows you to set your desired crown whether running flats, split butts or vertical. You can even run wide open. Deeper back spine allows for easier operation. Hard coat anodized for durability. Lid opens extra wide for easy clean-up. Built for performance and value. The 10" size is ideal for first coats. Look to a 7" Flat Box if you want something a little smaller for first coats, and to a 12" Flat Box for your second and final coats.