The caliber and sizing chart you provided is incorrect. 12 AWG is 3.31 square meters. mm, not 4.0 sqm. mm. This explains why the 12 AWG spade terminals I bought from you are too loose on 12 AWG stranded wire to be useful. There is nothing wrong with your product or quality. It's just that you don't have the right information or variants of the product I need. After reviewing your spreadsheet for appropriate tips, I realized that you may need this information. The number in () is the one you specified. = 0.823mm2 (1.0mm2) 20AWG = 0.518mm2 (0.75mm2) 22AWG = 0.326mm2 (0.5mm2) 24AWG = 0.205mm2 (0.34mm2) I've added pictures to make this better to show. Black is 12AWG, Red is 18AWG. You can see how loose the 12AWG is and the tip comes off easily while the 18AWG holds up well. I cut the wire to show the tolerances. Final thoughts: The seller offers a good product. Correcting the chart and adding the 3.5mm2 option changes my rating to 5 stars.