SC306CBN Spyderco Bench StoneThe SC306CBN is a dual sided bench stone built from Cubic Boron Nitride, a superabrasive second only to diamond in hardness, making it exceptionally efficient for sharpening and stropping high end steel blades. The 400 mesh side handles coarse work and repair, while the 800 mesh side refines edges to a fine finish. At 3" x 8", it's a compact yet capable stone suited for serious enthusiasts who want fast cutting action without the maintenance demands