The Bosch Router Bit Set - Fractional contains 15 router bits made of high-speed steel. The set includes straight bits, round nose bits, chamfer bits, cove bits, dovetail bits, and V-groove bits in 1/4", 3/8", and 1/2" shank diameters. The bits have a black oxide finish to prevent corrosion. This router bit set is designed for woodworking applications like edge forming, slot cutting, hinge mortising, and decorative profiling. The set comes in a plastic carrying case for storage and portability.