#52 size Commercial Grade replacement knife. Size replacement meat grinder knife. Fits many brands including Hobart, Biro, Berkel and others. (Some Toledo Scale grinders). (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. Will fit your grinder if your plates are 5 1/16 – 5 1/8 across. This knife typically fits most #52 meat grinders. We have the largest selection of stainless steel meat grinder plates and knives in North America. North America’s largest selection of stainless steel. Meat grinder parts and accessories.