Material and construction Made from carbon steel for strength, hardness, and a firm structure. Thread and clamping Spiral straight thread design enables more convenient clamping, faster replacement, and clamping force. Applications and compatibility Used for motor extension rod and replaceable drill chucks; fits chucks of various straight shank tools. Finish and performance The surface is smooth, leaves no scratches, and delivers stable performance. Benefits Durable and reliable for demanding drilling tasks. Quick and secure tool changes, reducing downtime. Broad compatibility with different straight shank chucks. Use scenarios In a workshop, extend drill reach with a motor extension rod to access tight or hard to reach areas while maintaining strong grip. Switch between drill bits with different straight shanks during a project without sacrificing clamping reliability. Upgrade or configure equipment to work with multiple chuck types, ensuring secure connections and stable operation.