Designed in collaboration with Archery guru John Dudley for the Nock On Nation Flat slightly wider pressure point improves accuracy and decrease torque at full draw especially in lower holding weight set-ups Higher wrist position increases stability at full draw by reducing tension in bow arm muscles Simple 2 screw installation mounts directly on the riser Ambidextrous design is compatible with both right hand and left hand bows Raised Nock on logos for increase confidence in consistent hand placement no slip surface For PSE Aluminum risers and Nock On Carbon Levitate bow Compatibility: Nock On Carbon Levitate Evo XF Evo EVL Nock On Embark Nock On Evo NTN Expedite Bandit NXT Drive NXT Stinger ATK Brute ATK NOTE: Each grip comes with 2 sets of screws. The black screws must only be used on the Carbon Levitate and the silver screws must only be used on aluminum model bows.