84641MB-Impact Socket Set-41PCs- ½”Drive

What does the “B” mean at the end of the 84641MB model number?

The “B” suffix is the official factory designation for a Blow-Mould Plastic Case. It means this full 41-piece kit comes enclosed inside an ultra-rugged, double-walled hard-plastic storage case custom-molded to match the precise dimensions of every socket, ensuring easy tool transport for mobile mechanics.

Why does this set provide duplicate metric runs from 9mm to 30mm?

The 84641MB impact socket set delivers two completely different structural lengths for every size. The 84400M standard series is optimized for high-torque operations in compact spaces, while the 84300M deep series features an extended hollow core built to pass straight over extra-long exposed bolt threads without bottoming out.

Can I use these black sockets with high-output air impact wrenches?

Absolutely. Unlike shiny chrome hand tools that can shatter under pneumatic stress, these sockets are forged from thick-walled Chrome Molybdenum (Cr-Mo) steel and treated with a protective black phosphate finish. They are engineered to handle the continuous high-frequency percussive waves generated by commercial ½”drive air or electric impact guns.