Hyde High Carbon Steel Joint Knife 0.63 in. H x 5 in. W x 8.25 in. L (Pack of 5)When modern drywall was introduced in 1936, it was Hyde the industry called on to design what became the drywall joint knife that we all still use today. For decades before and after that call, it was Hyde that supplied the tools of choice for professional painters, drywall pros, wallpaper hangers and other tradesmen. UPC: 079423027505 Manufacturer Part No: 02750 Brand Name: Hyde Material: High Carbon Steel Product Type: Joint Knife Height: 0. 63 in.