12pcs 3mm Shank Taper Machine Diamond Piston Grinding Files Feature:1. Applicable to mold processing and repairing, hard alloy, glass instrument, jade; for stone grinding, engraving, cutting line, grinding, hollowing; Jade, glass and other sculptures.2. Ideal for flying edges, burrs, casting weld repair, forging, welding parts; chamfering and grooving of various mechanical parts; inner hole pipe cleaning, finishing machine part, etc.3. It helps to improve work efficiency and reduce labor intensity.4. High quality metal process for long service life.5. Easy to use, safe and reliable. Specification:Item Type: File Shank Material: Alloy File Shape: Flat Twill File Material: Emery Weight: About 60g Total Length: About 70mm/2.8in Blade Length: About 25mm/1.0in Blade Width: 2mm/4mm/6mm Shank Diameter: About 3mm Grit: 100#, 150#, 200#, 300 #Lista Packing: 12 x File 1) We accept Alipay, West Union, TT. All major credit cards are accepted through secure payment processor ESCROW. 2) Payment must be made within 3 days of placing the order. 3) If you can't checkout immediately after auction close, please wait for a few minutes and retry Payments must be completed within 3 days. About shipping 1.