1、Tungsten carbide steel dental burs have 4 or 5 times of longer service life than emery ones. 2、High hardness, good cutting performance and high working efficiency. 3、It only need 1-2mins to dismantle a metal PFM crown or metal PFM tooth with tungsten carbide steel burrs, while emery burs may need half or a hour. 4、Incisive cutting edge, high concentricity, durable and steady, it can reduce labor of dentists and save time, improving comfort of patients. 5、No rust, wear resistant and high temperature resistant. Features: Tungsten carbide steel dental burs have 4 or 5 times of longer service life than emery ones. High hardness, good cutting performance and high working efficiency. It only need 1-2mins to dismantle a metal PFM crown or metal PFM tooth with tungsten carbide steel burrs, while emery burs may need half or a hour. Incisive cutting edge, high concentricity, durable and steady, it can reduce labor of dentists and save time, improving comfort of patients. No rust, wear resistant and high temperature resistant. The surface will be quite smooth after cleaning orthodontic adhesive. Mainly used for polishing, cutting and carving on metal, precious metal and resin. Specification: Material: Tungsten carbide steel Model: RA4, RA6, RA34, RA56, RA169, RA245, RA556, RA557, RA700 (Optional) Overall Length: 22.5mm / 0.9in Quantity: 5pcs Weight: 10g / 0.4oz (approx.) Package list: 5 * Dental Burs