Bit Material: High Speed Steel / Power Tool Hex shank - improves bit grip and allows use with a variety of drill types. Full-cone design - pulls the bit through material Premium bit material - combined with innovation for great performance and life. Designed for wood drilling - made for clean-boring holes through 2x4s Spur-and-reamer tips - provides cleaner holes by clearing chips faster. Contoured paddle design -improves speed with faster chip removal Includes: (1) 3/8 in., (1) 1/2 in., (1) 5/8 in., (1) 3/4 in., (1) 7/8 , (1) 1 in., (1) 1-1/8 in., (1) 1-1/4 in.