40-00008 8" DRYWALL KNIFE, PLASTIC | The Homax drywall knife is great for spreading and smoothing drywall joint compound or putty. constructed of heavy-duty, high-impact polystyrene, Homax drywall knife is both durable and lightweight. it's an easy to use and comfortable drywall tool to hold in your hand. ideal for new or patch and repair drywall jobs.