This Bitzenburger Zenith Fletching Jig and Clamp with Upgrade Kit has help set the industry standard for fletching tools for over 50 years. It is today’s only true precision fletching instrument used by every major manufacturer of quality arrows around the world. Unparalleled quality along with simplicity, design and precision sets this fletching tool in a class by itself. Designed by experienced archers for the perfectionist who wants the finest fletcher in the world for perfect arrow making. Constructed of die cast alloy, this self-supporting fletching tool features a strong permanent magnet which allows for very precise and uniform placement of all feather and vanes. Self-centering shaft cradle will accept and center any size shaft available today. Large dials at the top and bottom of the magnet holder make it easy to adjust your angle of fletching within seconds, to fletch straight, offset or true right or left helical. Feather spacing of 3 fletch 120 degrees, 4 fletch 75 degrees x 105 degrees, and 4 fletch 90 degrees can be selected by a slight screw adjustment. Optional nock receivers available to achieve 60 degrees x 120 degrees 4 fletch or 120 degrees 3 fletch cock vane down or up. The clamp is help at a 45 degrees angle so the arrow maker will have a clear view of the fletching at all times. All metal parts. Comes complete with wrenches and instruction sheet This Product comes complete with the Zenith Bitzenburger Upgrade Kit Installed: Zenith Archery Products has introduced a new upgraded nock receiver for your Bitzenburger fletching jig. The replacement body will fit directly into your jig and will still adjust for all three different fletching patterns. The original receiver held the arrow only by a loose fit on the nock. The new receiver comes with two inserts which are held into the body by a long screw which is tightened through the rear of the receiver and will hold the arrows directly, without slippage. One insert is sized to fit snuggly into any arrow which uses a G nock. The second insert does arrows which use pin nocks, holding the pin by the hole in the insert. It also does arrows which use Super nocks (.246 carbon, Super Uni-bushings, etc.) by fitting the insert into the back of the arrow. If the pin holder becomes too loose, just gently squeeze the segments together with a small plier until it holds the pin tightly again. This kit DOES NOT include a sleeve for X or H nocks. These are available as an option if needed. An adjustable upper support plate is mounted using the template and hardware included with the kit. Once the arrow is mounted in the jig, the plate is adjusted to support the upper end of the shaft.