Designed for use with Turbo Air Lappers and UHT Ushio Turbolaps. These diamond files are perfect for finishing in tight areas. The U-shape feature locks the file into the tool holder for our Turbo Air Lappers . The high quality diamond abrasive performs well in high speed and short stroke applications. Can also be used by hand with the Diamond File Holder (241-0684) . Each diamond file has maximum thickness of 1mm and tapers down to 0.5mm thick.