Evans Torque Key has an ergonomic grip for maximum comfort, a knurled knob for quick spinning, and a slip-resistant magnetic head. The torque handle can be set to a desired tension to help drummers attain more accurate tuning. For over 60 years, Evans has been an innovator in drumhead manufacturing and design. As the creator of the first synthetic drumhead and other revolutionary products such as EMAD, Hydraulics, and the UV1 series, Evans drumheads are designed with the intent of solving problems for drummers. Regarded for high quality and consistency all Evans drumheads are made in the USA and feature Level 360 Technology., Torque-handle can be set to desired tension, helps attain tuning accuracy, Magnetic head helps prevent slipping and stays in place for quick adjustments, Durable, ergonomic construction, Designed in conjunction with Ned Steinberger, All Evans accessories are designed, engineered and manufactured to the most stringent quality controls in the industry