House Brand Dentistry Endodontic Reamers 21mm #40, Stainless Steel 6/Box. HSB - House Brand Dentistry's Reamers Stainless Steel 400509 pack includes six high-quality 21mm #40 reamers designed for precise endodontic applications. Crafted from durable stainless steel, these tools excel at shaping root canals with a robust cutting action.Their ergonomic handles ensure comfort and control, making root canal treatments efficient and effective.