Queens Square Reflex Patella Percussor Hammer 8.5 Inch (22cm) White The Queens Square Reflex Hammer is designed to perform reflex tests with less effort and greater patient comfort. Head : Black rubber head with chrome finish. The balance-weighted head, diameter 2" diameter, 1/2" thickness. Handle : Plastic white shaft. One end has a screw fitting for securing into the head and at the tip end a Pointed Tip.