Produce consistent countersunk holes with precision bits for professional finish results * Hardened and tempered high-speed steel bits Titanium coated for durability & superior cutting power * Handy set of five commonly-used countersink sizes - 3/4", 5/8", 1/2", 3/8" & 1/4" * Precision-ground flute design gives efficient cutting with excellent chip evacuation * Use with hand or power drills in wood, plastic, aluminum; Length 1-1/2"; 1/4" shank (1/4" has 3/16")