Commercial Grade replacement knife. This Listing is for the. Size replacement meat grinder knife. Fits many brands including Hobart, Biro and others. (Some Toledo Scale grinders). Raised re-sharpenable cutting edges. (Lifetime Guarantee against rust). Size #52 replacement knives Premium. Fits most #52 size Electric grinders with plates that are 5 1/8 across. 7/8 (22mm) center square hole. North America’s largest selection of stainless steel. Meat grinder parts and accessories.