Up for sale is High Quality (Super Alloy Steel) Allen Hexagon Needle Set Screws #146427001 (#146427-001) - sold in pack of 10 and 100 pcs.
Fits Brother overlockers/sergers models:
EF4-B500 series, B600 series, N21, N31, V41, V51, V61, V81, DA-9270/9280, etc.
- For allen wrench screwdriver #S01943001 - you may order here: https://www.ebay.com.au/itm/174311353858