These are the suggested sizes of blades to choose for your arrow type

Arrow Spine Dia.mm      / Dia. insSuggested Blade Size
2314 etc.  9.15 mm    /    0.360" Wide
2014 etc. 7.95 mm    /    0.313" Wide/Narrow
1814 etc. 7.15 mm   /    0.281" Narrow
1616 etc. 6.35 mm  /    0.250" Narrow
3L-04 750 5.8 mm    /    0.228" Narrow
ACE 430 5.2 mm    /    0.205" Narrow/X Narrow
X10 450 5.0 mm    /    0.197" X Narrow