Features Our die cast clamps have the following qualities: Precious Ground Each clamp is precision ground to assure identical blade matching. True Helical Fletch The Right and Left helical clamps are ground with a radius to achieve a true helical fletch. Hollow Recess The hollow recess allows for thumb and fingertip control which provides for a tighter grip and more precise finished product. Graduated Scale The Graduate Scale at the rear of the base of the clamp allows for consistent and accurate spacing of the feathers and vanes from the nock. Knife Edge The knife edge on located on the base of the clamps eliminates build up of surplus glue and provides a clean and professional final product. (No messy arrows!) Die Cast Clamp Models Bitzenburger™ precision die cast clamps are available in three different models: Straight ClampsFor straight fletching Right ClampsFor true right helical fletching Left ClampsFor true left helical fletching