Chrome Vanadium Construction: Unlike impact sockets (which are dull black Cr-Mo), these are made from heat-treated Cr-V steel. They are stronger for static torque but should never be used with an impact wrench as they may shatter. An-Lock Drive®: This Hans-exclusive design ensures the socket grips the flat sides of the fastener rather than the points, providing higher torque and preventing the stripping of delicate E-Star bolt heads. 38mm Standard Length: Each socket in this set has a standard depth of 38mm, making them compact enough to fit into tight engine bays. The “B” Designation: In Hans nomenclature, the “B” usually signifies that the set is packaged in a Blow-mold case, whereas a “C” often refers to a blister pack or a metal rail. The case keeps your sockets organized and prevents them from rolling around in your toolbox.