Dental Mirrors #3, Cone Socket, 12/bx. Cone Socket Mirror #3, heads only, 12 pcs per box. Handles are available and can be be purchased separately. Made with quality Stainless Steel casing and German-made high quality glass mirror. A silicone seal between mirror and casing prevents water from entering during autoclave of instrument. No 3 mirror has 20 mm diameter mirror. Plane Surface mirrors.