Draper Step Drill Bit 4-20mm 71220

This Draper 71220 step drill bit is designed for versatile drilling across a range of materials, including steel, brass, copper, aluminium, wood, and plastics. It features a tapered, multi-step design that enables drilling to different hole sizes without changing bits. Constructed from high-speed steel (HSS) and hardened for durability, the bit carries graduations at 2 mm intervals from 4 mm to 20 mm, allowing precise hole sizing. It is compatible with standard drill chucks and suitable for use with electric drills and drill presses. The combination of material strength and stepped geometry supports efficient drilling with a longer lifespan, while the 4–20 mm range covers common sizing needs for various applications.

Features

• Versatile drill: steel, brass, copper, aluminium, wood, plastics
• Tapered design with 9 steps
• Steps marked 4–20 mm at 2 mm intervals
• Made from high-speed steel for durability
• Compatible with standard chucks and drills

Technical specifications

• Material: High-speed steel (HSS)
• Diameter range: 4–20 mm
• Step increments: 2 mm
• Number of steps: 9
• Applications: steel, brass, copper, aluminium, wood, plastics
• Markings: graduations from 4 to 20 mm