The UltraGrip is for use with modular gripped Hoyt Target bows. The idea of a higher grip angle is that it will relax your forearm muscles by slightly positioning your knuckles in front of your wrist joint. Give it a try, raise your bow hand and make a "stop sign with relaxed fingers" - you'll feel tension in your forearm. Now lower the angle of your palm (shift your knuckles more forward) and you'll notice how the tension in your forearm goes away. This translates to a softer more controlled aim and tighter groups down range.