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Step drill bits are designed to enlarge a hole as the bit drills through the sheet metal, wood, plastic, or PVC board. Each step on the bit is larger in diameter than the step before. Smaller step drill bits are self-starting and no pilot bit is required to start the hole. On larger step drill bits, you need to have a hole pre-drilled that is equal in diameter to the smallest step on the bit.
About High Speed Steel(HSS)
HSS-4241:
Suitable for workpieces with hardness below 25HRC, such as iron plate, aluminum plate, PVC plate.
HSS-6542:
Suitable for workpieces with hardness below 28HRC, such as iron plate, aluminum plate, metal sheet and copper plate.
HSS-CO/M35:
Suitable for workpieces less than 5mm thickness, such as iron plate, aluminum plate, metal sheet, or workpieces less than 1mm thickness of stainless steel.
Note: While drilling on 304 stainless steel, thickness under 1mm you can use a hand drill with power above 800W, thickness between 2-3mm will require a bench drill with speed below 500 rpm.
About Drill Bit Shanks
Triangular Shank
Hex Shank
Round Shank
About Surface Treatment
Nitride
M35 Cobalt
Titanium Coated
Original Silver Tone
Ideal for drilling holes for these materials
Metal Sheet
Wood
PVC Board
Plastic
Wide Applications
Drilling Machines
Milling Machines
Hand-held Drilling Rigs
Bart Fisher
Reviewed in the United States on January 14, 2025
Good
Barry
Reviewed in the United States on September 9, 2024
I was hesitant to use such a cheap drill bit on my cargo van to bore out holes for rivet nuts but this has been a god send. I have drilled out about 25 holes to 9mm and each one fits the rivnuts snug. I definitely got my moneys worth at a fraction of the cost of a hardware store.
Debra
Reviewed in Canada on July 12, 2024
I work with steel for a living. I know enough to use lubricant when drilling metal. that being said this thing dulled out after the first hole. Softest drill bit i have ever used!
Dom
Reviewed in the United States on November 13, 2024
None of the steps are the right size. 2.77mm, 3.79mm, 4.85mm, 5.79mm, 6.75mm, 7.85mm, 8.79mm, 9.70mm, 11.86mm, 12.79mm. I need something exact and this is not it. It does cut plastic very nicely but not to the right size.
Denise
Reviewed in Canada on October 2, 2024
good for 4 or so holes and dead by 6
Faye Pleasants
Reviewed in the United States on July 29, 2023
Would buy another one if I need a new one for different sized grommets holes to make in my mason jar tops! Much better than having a lot of individual bits and it was easier to get the perfect fit because of all the choices of sizes!
M
Reviewed in the United States on November 19, 2023
As anyone who works on cars can vouch, the metric measurement system is all that is used for fasteners whether a car is foreign or domestic. I needed to drill holes for a project that was using metric fasteners and it is virtually impossible to find a metric step bit locally. This bit fit the bill and made nice quality holes. Can't go wrong with it and nice to keep in the toolbox should you ever need it.
ARC
Reviewed in the United States on May 29, 2021
I've only used this once, to drill a hole in the bottom floor of my Ooni pizza oven. Works perfectly. Gold/brass finish looks a little scrapped off, but otherwise, the bit looks perfectly intact. I'm sure it'll work fine for awhile.
Kindle Customer
Reviewed in the United States on January 29, 2021
I've used these for several years. They don't grab and deform thin and soft materials like sheet aluminum. The step above the size you need will clean burrs off as well. Just be careful you get the bit stopped before the hole is too large. Work great on plastics, even brittle ones like plexiglass that shatter with a twist drill.
A Guy Named Jeff
Reviewed in the United States on April 9, 2021
I drilled through a steel strip with no issues. Got the job done. And, this drill bit is quite affordable, too.
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