The Merit Buck Percussion Hammer is a diagnostic instrument to evaluate myotatic and cutaneous reflexes. This can often lead to detection of other neurological abnormalities in a patient. The double head consists of two rubber tips of different sizes. Merit instruments are Sklars office-grade line of products and most commonly utilized for routine and in-office minor procedures. This product is 7 inches long. It also features a brush and needle, which are stored in the handle of the instrument.