Optimum grade carbide tip maximizes durability and longevity. Innovative tip reduces walking on material surface. Unique flute design removes dust reducing bit binding. Set includes: (1) 3/16" x 3" (1) 1/4" x 4", (2) 1/4" x 6", (1) 5/16" x 6", (1) 3/8" x 6", (1) 1/2" x 6".