JCB Mild Steel Breaker Coupler is a mechanical component used to attach a hydraulic breaker or hammer to a JCB excavator. The coupler is designed to provide a quick and easy way to attach and detach the breaker from the excavator, allowing for efficient and flexible operation. Mild steel is a low-carbon steel alloy that is often used in the manufacturing of couplers due to its strength and durability. JCB Mild Steel Breaker Coupler is also cost-effective and easy to machine, making it a popular choice for a wide range of applications.