The Bottom Bracket Facing Set is designed to be a complete self-contained facing set, combining finest top quality precision parts with ease of use. Simply install the threaded inserts using the facer handle, then insert the facing tool through the guides & install the tension spring & speed nut. After applying a liberal amount of cutting oil, the BFS-1 easily cuts the shell material, giving you a clean, faced surface. Now youre ready to install the bottom bracket.