Features: Package includes 12 pcs sharpener, with 5/32", 3/16" and 7/32" size for option. Made of premium quality material with titanium plating process, solid and strong for long lasting. Diamond particles on the drill bit are polished finely and evenly, hard and not easy to wear. 1/8" shank, suitable for sharpening chain saw teeth so as to prolong the service life. Perfect accessory to get rid of troublesome hand sharpening once and for all. Specifications: Material: Carborundum + Metal Size: 5/32in (4.0mm) / 3/16in (4.8mm) / 7/32in (5.5mm) (Optional) Shank: 1/8" Quantity: 12 Pcs Package Size: 18 * 15 * 1cm / 7.1 * 5.9 * 0.4in Package Weight: 4.0mm: 45g / 1.6oz 4.8mm: 56g / 2.0oz 5.5mm: 67g / 2.4oz Package List: 1 * Sharpener Set (12 Pcs)