The Tru Tuner Rapid Drum Head Replacement System provides you with a quicker, more convenient way to change out your heads. This device uses multiple strategically placed keys to loosen and tighten all of the tension rods simultaneously. With numerous placement marks, this device can be used on drums of all different sizes and lug configurations. Works with 8″, 10″, 12″, 13″, 14″, 15″ and 16″ drums, and most standard 4, 5, 6, 8 and 10 lug patterns (the exception being 14″ and 16″ 6-lug). The clear reinforced polycarbonate surface provides rugged durability as well as a clear view of what you’re doing. The Tru Tuner fits easily into a cymbal bag for safe keep and transport. So spend more time playing and less time tuning thanks to the Tru Tuner.