29 Piece Set Includes 1/16″ to 1/2″ by 64ths drills. Cobalt Drills Are Designed To Cut Through Extremely Hard Metals, Including Stainless Steel. No Center Punch Needed. Century 135 Degree Quick-Cut Points Are Self-Centering And Penetrate Faster With Less Pressure. Will Not Walk Or Wander At The Starting Surface.