Ultimate Arms Gear Gunsmith & Armorer's 6pc Steel Needle Files Trimming File Lapidary Rasp Tool Set Kit with Soft Grip 6pc Set Includes: Mill, Round, Half Round, Triangular & Square. Length: 6.5 / Working Length: 4" / Grit: 70 Cuts/Inch (Coarse) / Thickness: 3mm / Hardness: 62HRC / Bearing Steel Material / Plastic Handle Great for Gunsmithing Filing Metal, Plastic, Wood, Stone, Wax Etc