Three styles of tools for adjusting the temper resistant screws found on many shears today. 4 styles of adjusting key. Watch the video to see how to use this tool.
Spacing size on the key
#3 4.5mm
#4 5,6,7 mm
#5 5, 5.5, 6, 7 8mm
#6 4, 5mm (best for German scissors)