Specification: Item type: File; Shank material: alloy; File shape: oblique flat; 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: 150#, 200#, 300#, 400#. High Quality Metal: This diamond file is made of high quality metal, the fine grain texture of the rasp file set is deeply hardened and coated for long service life. 12 Pieces: 12 different pattern alloy files, 2.8 inch total length, 1.0 inch file length, 3 mm diameter for each file. Application: This vibration file can be used for removing, refining, reshaping and scraping projects. This vibration file is applicable to the processing and repair of molds, hard alloys, glass instruments, jade. Safe Reliable: This diamond file set can help improve work efficiency and reduce labor intensity, easy to use, safe and reliable. Quantity delivered: 12 pieces 12 pices