Complete Solutions for 1/2-Inch to 2-Inch conduit. Fast, accurate holes in stainless steel, mild steel, iron, copper, brass, aluminum, fiberglass and plastic sheet. Extends tool life with reduced friction, torque and heat. Quick Change Arbor – change cutter heads with a simple push and turn. Split point, cobalt-steel pilot drill eliminates walking and penetrates quickly. Precision engineered, tungsten carbide teeth for fast cutting of round, burr-free holes. Optimized carbide placement reduces friction and torque – requires less force and generates less heat while cutting. Flange Stop for Safety – prevents over-drilling. Application: Cut fast, accurate holes in stainless steel, mild steel, iron, copper, brass, aluminum, fiberglass and plastic sheet up to 3/16-Inch (4.8mm) thick. Cutting Edge: Tungsten Carbide Teeth. Hole Size: 6 sizes: 7/8-Inch, 1-1/8-Inch, 1-3/8-Inch, 1-3/4-Inch, 2-Inch, 2-1/2-Inch. Maximum Cutting De: 3/16-Inch (4.8MM). Pilot Drill: Cobalt High Speed Steel 645-001: Use with 645-011 Arbor, 645-002: Use with 645-022 Arbor. Pilot Drill Size: 645-001: 1/4-Inch X 2.56-Inch Long, 645-002: 5/16-Inch X 2.72-Inch Long. Shank Size: 645-011: 3/8-Inch (9.5mm), 645-022: 7/16-Inch (11.1MM). Kit contents: 645-7/8, 645-1-1/8, 645-1-3/8, 645-1-3/4, 645-2, 645-2-1/2, 645-011, 645-022, 2 hex keys. Ejector Spring – automatic slug removal with every cut.