AFTCO Spin Strap should be used with a shoulder harness to help maximize leverage when fighting bigger fish with spinning tackle. Wrap the strap around the rod foregrip, slip one end through the slot, then attach D-rings to harness clips. The AFTCO Spin-Strap, when used in conjunction with a shoulder harness, allows for increased leverage when fighting bigger gamefish with spinning tackle. The strap first wraps around the rod fore-grip, and the D-rings (one slips through strap's slot) connect to each of the harness clips. Works perfectly with our MaxForce II Shoulder Harness.