... keep them in perfect cutting shape. The best of edges will quickly dull if it strikes metal, glass ... board is safer for the user. Frequent use of a sharpening steel will keep blades in tip ... remove too much metal, can harm the temper of the blade, and most important can change the ... !Contact Information:Company Headquarters Address: No.1 of 4, The 3rd Rd.of Huoda, Nahuo industrial Zone, Yangdong City, ...