Works as it should  12" bone 17 " arm .This DW clamp is designed to securely hold your cylinder in place while playing the drums. It is made with high-quality materials to ensure durability and long-lasting use. This clamp is perfect for any drummer looking to upgrade their setup and achieve a more stable and secure playing experience. The DW Dog Bone Double Clamp Boom Straight Cymbal Arm is compatible with most cylinders and is easy to install, making it a great choice for anyone looking to improve their drumming. Its sleek design and sturdy construction make it a reliable choice for any musician. With this clamp, you can focus on your playing without worrying about any slipping or sliding issues.