platinum professional 10" drywall flat finishing box w/ 54" box handle platinum delux the platinum drywall tools 10" flat finishing box is a designed to dispense just the perfect amount of joint compound to drywall flat seams and butt joints. the highly durable anodized aluminum body is built tough to withstand everyday use. the adjustable blade dial allows you to get the exact finish desired. the platinum flat box handle is configurable for your ideal size from almost all applications.