This is a good choice if you are doing carpentry for wood floors and making tongue and groove joints on thinner wood. This is a professional tongue and groove router bit, which is suitable for carpenters to make wood floors by hand or other carpenters. You can use router bits to make interlocking joints for wood floors, which have a larger surface area and better strength. This is a good choice if you are doing carpentry for wood floors and making tongue and groove joints on thinner wood. This is a professional tongue and groove router bit, which is suitable for carpenters to make wooden floors by hand or other carpenters. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.