Magafor 1055 Series Cobalt Steel Combined Drill and Countersink, Uncoated (Bright) Finish, Plain Style, 60 Degrees, #3 Size, 0.25" Body Diameter Plain-style combined drill and countersink creates a 60-degree countersink, which can be used as a center hole for machine centers 118-degree conventional point drills a center hole while the two spiral flutes clear chips away to prevent clogging Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials Uncoated (bright) finish has no additional surface treatment or coating Double-ended to provide two cutting ends