SKLZ Refiner Driver Dual-Adjustable Hinged Training Club. Breaks in the Refiner show breakdowns in your swing. The patented, two-way adjustable hinged clubs give instant feedback on tempo and swing plane to smooth out your swing. Even hit balls with it.460cc head Patented, two-way adjustable-hinged driver Swing flaws are immediately exposed by a break in the hinge Engineered to hit golf balls and teach a smooth, even-tempo swing Can be used at the range, home, or office, any time of the year Promotes better ball contact for straighter, longer shots Patented see-through grip graphics for ideal hand placement Includes adjustment key/divot tool