Plumboss 9 Step Drill Bit 4-20mm | SD4-20

Plumboss 9 Step Drill Bit 4-20mm One drill bit for nine hole sizes The Plumboss 9 Step Drill Bit is designed to deliver fast, accurate drilling across nine common hole sizes with a single bit. Covering sizes from 4mm to 20mm (4, 6, 8, 10, 12, 14, 16, 18 and 20mm), it eliminates the need to constantly change drill bits, improving productivity on site. Constructed from High Speed Steel (HSS) with 5% Cobalt, it provides excellent wear resistance and long service life when drilling through sheet steel, stainless steel and other tough alloys. The self-starting split point tip eliminates the need for pilot holes, allowing faster starts with greater accuracy. A spiral flute design removes swarf efficiently for smoother drilling and cleaner holes, while the 1/4" quick change shank enables fast bit changes and compatibility with most drill drivers. Designed for professional plumbers, electricians, HVAC installers and general tradespeople, it delivers reliable trade-quality performance across a wide range of applications.