Ahead Robo Key
ROBOKEY Speed Tuning Key is a simple yet ingenious devise designed to make drum head changes quicker than ever. Every turn of the wrist spins the drum tension bolt 4 times (in or out). With no batteries to change or adapters to lose, the RoboKey is designed to last a lifetime. You can increase speed up to 6x and more by spinning the gear drive AND the handle in opposite directions.