QuikFletch Twister features NAP"s patented micro-grooved vanes for enhanced stiffness, spin and accuracy at an economical price * The QuikFletch Twister shrinks to fit any size carbon or aluminum arrow shaft * The microgrooves have been proven to spin the shaft twice as fast as with a standard vane * Weight: 35 grains; Vane Height: 15/32" (0.47")