Basic size Top knife: 90x60x1.2mm Material: HSS Bottom knife: 90x60x10/8mm Material: SKD11 To get a quote or more details sooner about this top and bottom knife, please email us at phoebe@lcblade.com OR whatsapp +86 13399550005 Top and bottom circular slitters are used on slitting and rewinding machine for paper, film, metal sheet and so on slitting. Circular slitter blades are widely apply to packaging industrial, printing industrial, rubber industrial, metallurgical industrial, paper industrial.