Festool 491391 Chamfer Trimming Router Bit Inserts HW D 19/12 S8, 4-Pack are designed as reversible cutters compatible with the 491084 model. These high-quality inserts measure 12x12x1.5 mm and come in a convenient pack of four, ensuring you have reliable s on hand for your chamfer trimming needs. Crafted to meet Festool's standards, they provide precision and durability for your routing projects. Model Number: 491391