This 1/2″ Chuck is a direct replacement for Drill Doctor models XP and 500X. Holds bits from 3/32″ to 1/2″. To sharpen larger bits up to 3/4″, upgrade to the Large Bit Chuck. This chuck will NOT fit models 350X, SB, or any Classic Drill Doctor sharpeners. (Drill bit not included.) ⚠ Not for Sale in Quebec Due to compliance requirements outlined in Quebec's Bill 96, this product is not authorized for sale or shipment into the province of Quebec. The product packaging, user manuals, and/or product labeling do not meet the French language requirements for Quebec as mandated under current regulations.