The Fab-Master hand grooving system incorporates many of the same design features that Glass Master has perfected for use in its high-volume production grooving machines. It dramatically reduces time spent measuring and locating where to cut. The "no-marking, no-add-ons" design—with easy-to-read, pre-numbered tools—substantially reduces the opportunity for error. The Fab-Master is a very valuable tool for every contractor doing fiberglass duct fabrication. The Fab-Master Shiplap Kit consists of the measuring square and hand tool numbers 1, 2/4, 3 and 5S. When ordered with a protective carrying case, a number 6 hand tool and a Cuts-All tool are also included. An easy to follow, step-by-step guide to using the Fab-Master system is included with every kit. Fab-Master Kits, with and without protective cases, are available to groove 1...See More IN and 1.5 IN board. Standard Features Lightweight anodized aluminum Fab-Master tools are ergonomically designed for an extremely comfortable fit. Large tool sledding areas facilitate smooth, precision cuts and minimize operator fatigue. Cutting blades are constructed of high quality spring steel, sharpened, heat treated and coated for an incredibly long life. ​​The Fab-Master Square Adjusts quickly to cut 90°, 75°, 67.5°, 60°, and 45° angles Doubles as a straight-edge cutting guide Folds up quickly into a single, 48-inch-long section for easy storage Optional Accessories The number 6 tool is used to cut both male and female shiplaps simultaneously, and is extremely helpful when shortening duct section length, installing end-caps or making stronger, more precise offsets. The V tool produces a standard 90° groove for simple closures. Many other versatile Glass Master accessory tools, such as the Cuts-All, Peeler Knife and Round Hole Cutter, can also be added to the set. All hand tools, the Square and the case may be purchased separately. See Less