This support ring is made of sturdy cast iron, ensuring long-lasting use and stability.  With a 4" diameter and a distance of 4-1/2" from support to center of the ring, this support ring is perfectly suited for a variety of lab applications. The zinc-plated finish adds an extra layer of protection against corrosion and wear. The support ring comes with a boss head clamp and thumbscrew for secure attachment to ring stands. Upgrade your lab setup with the heavy iron support ring for enhanced support and convenience.