Commercial Grade replacement knife. This Listing is for the. Size heavy duty meat grinder knife. Fits many brands including Hobart, Biro, Berkel and others. (Some Toledo Scale grinders). Note: This blade is very heavy duty and made for commercial grade units only. (Lifetime Guarantee against rust). Fits commercial grade #52 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 1/8 across. North America’s largest selection of stainless steel. Meat grinder parts and accessories.