CO-Z HSS 5PCS Titanium Step Drill Bit Set with Automatic Center Punch, 50 Sizes in 5 High Speed Steel Drill Bits Set for Sheet Metal with Aluminum Case, Multiple Hole Stepped Up Bits for DIY Lovers

Description: Our step drill bit set provides faster and more convenient drilling than single flute bits. The easy-to-read step markings and targets save time when drilling holes, perfect for HVAC work, home repairs and light jobs such as drilling holes in plastic, aluminum, copper, stainless steel and many other types of sheet metal. Double cutting blades and X-type openings design ensure a faster and smoother cutting and 3-sided shank design prevents slip in drill chuck. Specification: Size: #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'') Material: High-speed steel Package List: 5 x Step Drill Bit Set 1 x Automatic Center Punch 1 x User's Manual 1x Aluminum Case