Update review.
If you use micro diameter arrow .125, .166 ID then the fletching may get in contact with the smallest blade #4. However, always like the other brands, it needs a bit of DIY to modify the width of the blade for better clearance. I recommend slowly grinding to avoid overheating and overgriding. If you mess it up with grinding, Bogentandler is SUPER helpful and will help you re order just the blade.