USG Sheetrock 6-Inch High Carbon Steel Taping Knife w/ Matrix Style Handle The USG Sheetrock 6-Inch High Carbon Steel Taping Knife with a Matrix Style Handle is a durable and reliable tool designed for professional drywall installation. The high carbon steel blade ensures precise and smooth cutting, while the matrix style handle provides a comfortable grip for extended use. This taping knife, model number 340030, is a must-have for any business or industrial setting requiring accurate and efficient taping work. Item is new with exterior paint on handle. Never Used.