Professional Letter Opener Blade Blank Stainless steel blade polished to a mirror finish, with relatively sharp chisel edge Metal has been cryogenically tempered with liquid nitrogen at -305F, enhancing its strength and edge holding capacity Overall length of 9-5/8", blade length of 5-1/8", 1/16" tang thickness, uses two 3/32" pins Blade blank for making your own custom letter opener!