Welcome to WellableMachine, an independent resource for anyone who drills, taps, fastens or builds. We publish clear drill and tap size charts, honest drill bit and power tool buying guides, and practical how-to articles for DIYers, hobby machinists, makers and tradespeople.
Picking the right drill bit or tool should not take hours of guesswork. Online listings often look the same, size charts disagree, and a wrong choice can mean a stripped thread, a burned-out bit or a cracked tile. Our job is to give you accurate numbers and straight answers, so you can get the job done right the first time.
What We Cover
- Size charts: tap drill sizes (UNC, UNF, metric and NPT), drill bit size charts, fractional, number, letter and metric conversions, and hole sizes for screws, bolts and anchors.
- Drill bits: bits for metal and stainless steel, wood, concrete and masonry, tile, glass and acrylic, plus drill bit types, coatings and sets.
- Power tools: cordless drills, hammer and rotary drills, impact drivers and wrenches, and drill presses.
- Sharpening: drill bit sharpeners, bench grinders and die grinders.
- How-to guides: drilling metal, concrete, tile and glass, and removing broken bolts, screws and rivets.
Our Mission
Our mission is simple: help you choose the right size, the right bit and the right tool for every hole you drill. Every chart, guide and review on this site is written to answer the questions people actually ask in the workshop. What size do I need? Which bit will cut this material? Is this drill worth the money? What could go wrong?
Who We Are
WellableMachine is written and maintained by the Wellablemachine Editorial Team, a small group of writers and researchers with a strong interest in tools, machining and DIY. We build our size charts from recognized thread and fastener standards and manufacturer data, cross-check figures before publishing, study product specifications and manuals, and analyze large numbers of verified customer reviews. Where we have hands-on experience with a tool, we say so clearly.
How We Choose Products
Every product we recommend is chosen on its merits. We look at material and coating, cutting performance, durability, power and battery life, ergonomics, safety features, warranty and overall value for money. Brands cannot pay to be included in our lists or to get a better rating. Read the full details in our Editorial & Review Policy.
How We Make Money
WellableMachine is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate, we earn from qualifying purchases.
When you click a link on our site and buy something, we may earn a small commission at no extra cost to you. These commissions keep the site running and our charts free. They never decide which products we recommend. Learn more in our Affiliate Disclosure.
Work Safely
Drilling and power tools can be dangerous. Always wear eye protection, follow the manufacturer’s instructions and double-check critical measurements before you cut. Our content is general information, not professional engineering advice. Please read our Disclaimer.
Get in Touch
Spotted a number that looks off, need help with a size, or want us to cover a tool? Visit our Contact Us page and the Wellablemachine Editorial Team will get back to you as soon as we can.
Thanks for visiting, and happy drilling.
The Wellablemachine Editorial Team
Have a question or spotted an error?
Our editorial team usually replies within 2–3 business days.