Drill Doctor The five new-generation Drill Doctor drill bit sharpeners sharpen high-speed steel, black oxide, carbide, TiN-coated, cobalt, and masonry bits. The DD750X pro model allows the user to create a custom variable-point angle between 115 and 140 degrees, change the amount of bit material removed, and create self-centering split points. The 750X's chuck sharpens sizes from 3/32 inch to ¾ inch. 888.693.7455. www.drilldoctor.com. Circle 101. For more Tools & Hardware Hot Finds, see page 92.