General description High-quality 5 Pcs Step Drill Bit Set featuring titanium-coated drill bits designed for drilling through various materials including steel, wood, plastic, brass, aluminum, and PVC. The set replaces 50 individual drill bits, making it a versatile addition to any DIY or professional toolkit. Technical specifications Material: High-speed steel with titanium coating Sizes and steps: #1: 3/16" to 1/2" (6 steps: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2") #2: 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") #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: 1/4" 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") #5: 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") Included: 1 x 1/4–1–3/8 Step Drill, 1 x 3/16-7/8 Step Drill, 1 x 1/4–3/4 Step Drill, 1 x 1/8–1/2 Step Drill, 1 x 3/16–1/2 Step