The Milwaukee 8-in-1 Square Drive Multi-Bit Driver features 3-1/2" interchangeable power groove bits that are power tool compatible giving you maximum job site versatility. This multi-bit screwdriver also has wrench-ready hex shanks providing you with additional leverage. The interchangeable bits are precision machined and chrome-plated, providing marine-grade rust protection and reduced wear giving you the best job site durability. This screwdriver features magnetic bit retention providing you with consistent driving performance.