4 Pcs Drum Keys feature quality chrome-plated construction, and are perfect for all drums with standard 1/4" socket square tension rods. Our convenient and economical includes 3 different type keys makes it ideal for quickly and easily removing and replacing drumheads.Wide application: The drum tuning key is suitable for drum lovers, drummer playing, beginner practicing; It also will be a good gift for your friends.Guarantee: Our product have 180 days warranty, if you have any question about this product, please feel free to contact us, we will try our best to help you solve your problem.