Can be used for rough work and hard materials. It can be used with confidence by carpenters, electricians, and the general public. Molybdenum-based HSS is resistant to shock and heat. The blade is resistant to chipping and cracking. Can be sharpened with a grinder. The heat will not cause the blade to harden. Of course, it can also be sharpened with a whetstone. The blade is sharp and long-lasting. The blade is thinly finished for good bite. Size: 9mm, 15mm, 24mm, 30mm, 36mm. Material: HSS in wooden box. International Buyers – Please Note. Thank you for your understanding.