Handsewing Harness Needles - John James #003
The gold standard for every professional leatherworker worldwide. These are the needles that have been used for years and years, are hardwearing, resistant to bending, and with a nice small size.
We use the #003 size for everything in our workshop as it provides the perfect balance of small size and high strength. It works well with 0.6-1mm threads.
You will almost certainly lose these before they break or have any issues. We have a few needles in the shop that are reaching 10 years of age.