Grizzly Industrial Carbide Tipped Stile & Rail Set - Quarter Bead 4in. Dia.. Carbide tips maintain high stock removal rates while maintaining a sharp effective edge. Since the carbide is inserted between the original HSS steel stiles each stile has an unbreakable steel safety pin that locks the blades in the desired position during planing or shaping. And each stile & rail set comes with a convenient padded plastic case for safe keeping. HSS tooling and a convenient case make this an affordable high-quality stile and rail set that will last a lifetime not to mention it will save you a small tree. Package Contents: Grizzly Industrial Carbide Tipped Stile & Rail Set Grizzly Industrial C2175Z: Carbide Tipped Stile & Rail Set - Quarter Bead 4in. Dia.