Basic size: 76x19x6.2mm Material HSS Hardness 61-62HRC Teeth needed To get a quote or more details sooner about this pneumatic air knife holder , please email us at phoebe@lcblade.com OR whatapp +86 13399550005 Disk knife with bearing inside is a part of pneumatic knife holder, usually with material 9CrSi, SKD11, HSS and so on.