The ServoCity 2920 Series Steel Set-Screw Collar (12mm Bore) - 2 Pack is crafted from durable steel with a zinc-plated finish, ensuring robust performance and resistance to corrosion. Each collar is designed to securely hold components in place on a 12mm shaft, making it ideal for various mechanical applications. The set includes two collars, providing reliable and efficient functionality for projects requiring precise component alignment and stability.