Incorporates Bohning's clamp style inserts. Fletch any diameter arrow or crossbow bolt. Easy to use. Easy to clean with Acetone. Fletches 3 degree right helical. Other inserts available. Folds flat. Portable/packable. Great for your bench, hunting camp, club, or in your pack. Fletch with nock on, perfect indexing. Small package size: 4" x 3" x 9".