Simply Detailed Parameters : 1. Basic size (ODxIDxT) : 90x65x8/10mm 2. Material: SKD11 3. Hardness: 58-59HRC 4. Angle of sharpening edge: 3 degrees 5. One ring in the middle to pretect shaft from demage of screw 6. Size of step 1mm one side To get a quote or more details sooner about this bottom knife, please email us at phoebe@lcblade.com OR whatsapp +86 13399550005