Norton India Alundum 175th Anniversary Stone 1in. x 2in. x 6in. NTIB6. This replacement stone features a rounded convex shape and is engravable with an impressive deep cabochon face. The convex portion is important for proper blade sharpening which creates an even greater need for sharp blades. Norton India Alundum 175th Anniversary Stones are designed to work on any of Norton's wide variety of conventional and serrated edged products including but not limited to Norton G.I. Kaina Bahco Ruvo Buderus J.B. Stone Polcar Wetterhus etc. Produced with the highest quality standards this replacement blade stone will keep your standard thickness blades firmly in place. Package Contents: Norton India Alundum 175th Anniversary Stone Norton NTIB6: India Alundum 175th Anniversary Stone 1in. x 2in. x 6in.