The Pro Class Right Helical Fletching Jig makes a perfect fletch every time with easy offset adjustments and accurate "snap" indexing. The Pro Class jig has a quick-set magnetic clamp with larger grips for easy operation. Pro Class offers total flexibility and versatility...fletch with the nock in place, and set your own degree of offset! Accommodates shaft sizes small (13/64) to large (27/64) and vanes or feathers up to 5".