A great tool from days gone by. No more guessing where your balsa fins go, this guide does it all for you. Easy to follow instructions are included. No more door frames needed to draw that straight line for fin placement. Works with 3/32" (2 mm) or 1/8" (3 mm) balsa. (Body tubes and balsa not included.)

This tool helps for both: 3 and 4 fins configuration.