– Set includes five standard step drill bits that can replace 50 individual drill bits – High-speed steel with titanium coating to easily cut through steel, aluminum, copper, plastic, and wood – Automatically deburr holes while drilling to keep the drill bit clean. – Includes a center punch that delivers an automatic, high-impact, spring-loaded strike through adjusting the cap – The centre punch has brass body, deeply knurled surface, and is carbide-tipped bit – Double cutting blades and X-type openings design ensures a faster and smoother cutting – 3-sided shank design prevents slip in drill chuck SIZES: #1: 1/4″ to 1-3/8″ 10 Steps (1/4”, 3/8″, 1/2″, 5/8″, 3/4″, 7/8″, 1″, 1-1/8″, 1-1/4″, 1-3/8″) #2: 3/16″ to 7/8″ 12 Steps (1/4”, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″) #3: 1/4″ to 3/4” 9 Steps (1/4”, 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″) #4: 1/8″ to 1/2″ 13 Steps (1/8″, 5/32″, 3/16”, 7/32″, 1/4”, 9/32″, 5/16″, 11/32″, 3/8”, 13/32″, 7/16”, 15/32″, 1/2”) #5: 3/16″ to 1/2″ 6 Steps (3/16”, 1/4”, 5/16″, 3/8”, 7/16”, 1/2”)