Milwaukee Twins Shock Absorber Spanner Wrench Milwaukee Twins Motorcycle Shock Spanner Wrench is a must-have for adjusting your shock pre-load without damaging your shock or your knuckles. This spanner wrench holds the adjustment holes at the bottom of the shock in two positions giving you a firm grip to adjust the preload without slipping out of the adjustment holes. Features: Made from stamped steel Enables a firm grip for adjusting shock preload