-Fully-hardened, expertly-tensioned tool steel body for true and accurate cuts, meticulously hand hammer tensioned-A new grade of extra hard carbide resists both abrasive and chemical wear better than standard grades for longer life-Resin bond-filled expansion slots to absorb any vibration and for quieter cutting-TENRYUfS fine grit honing ensures mirror finish on carbide for the keenest possible edges and a super clean cut