Tap Drill Size: Imperial (US) & Metric Chart
Find the correct tap drill size for UNC, UNF (US) and metric threads with these charts. Drill bit diameters in mm, inch, and common tap sizes.
Drill Bits
Drill Bit Size Chart
Drill bit size chart with common bits in inches and millimeters. Use the included drill size converter for inch ⇄ mm conversion.
Titanium vs Cobalt Drill Bits: Which is Better?
The titanium coated drill bits and cobalt bits are the two most commonly used bits for drilling metal. Find out which one is better.