The Graham Field Dejerine percussion hammers are professional diagnostic instruments from the Grafco line. These hammers feature a hollow stainless steel handle designed for perfect balance and a double-sided head with high-quality rubber bumpers to effectively elicit muscle reflexes. The 1312-1 is the standard model for reflex testing, while the 1312-2 adds a screw-in stainless steel needle, allowing clinicians to conduct both reflex and pain sensitivity examinations with a single tool. Both models are 8 inches long and built to withstand the rigors of daily clinical use.