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I was using a drill press and the bits just kept spinning and barely made a dent. I switched to a new cobalt bit and that barely did anything. Then I switched to a HSS Dewalt drill bit and drilled using a hand drill in a scrap piece of steel to see if it would work.... which it did. Went through extremely easy.

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I researched and it appears cobalt bits are designed for harder materials, like hardened steel, while HSS bits are for softer materials.

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A Reddit for Machinists of all varieties. From Old School conventional guys, to CNC Programmers, to the up and coming next generation.

I'm trying to drill a hole for a wedding knife cake set I made. I'm able to drill through the metal ring and epoxy handle without any issues. But I can't drill through the knife tang and server tang (I guess my heat treat went extremely well!).

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Take care of all your day-to-day drilling tasks with ease, with the help of the RYOBI 25 Piece Metric High Speed Steel Drill Bit Set. This handy set can be stored in a shelved position or hung for added convenience. You'll find 25 metric drill bits in each set – ranging from 1.0mm to 13mm in 0.5mm rises.No matter what applications lay ahead of you, the RYOBI 25 Piece Metric High Speed Steel Drill Bit Set can help. The HSS construction means each bit can withstand higher temperatures and cut faster than high-carbon steel alternatives. With added durability and strength, you'll have just what you need to drill through timber, wood, and plastic. For the perfect drilling in your DIY projects, turn to the RYOBI 25 Piece Metric High Speed Steel Drill Bit Set.Grab your RYOBI 25-piece metric HSS drill bit set from your local Bunnings Warehouse today.

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By registering for this e-gift card promotion, you agree to these Terms and Conditions, which will at that time, become binding between you and us.