Use to loosen and tighten screws, nuts and boltsIncludes 3/8" square x 5/16" hex bit holderDriver is easily reversible for tightening applicationsSpecial handle reduces risk of injury when striking driver with hammerSet includes eight standard and long length interchangeable bitsSizes include: #2 Phillips, 1-3/8" long 5/16" hex bit; #3 Phillips, 1-3/8" long 5/16" hex bit; 5/16" slotted, 1-3/8" long 5/16" hex bit; 3/8" slotted, 1-3/8" long 5/16" hex bit; #2 Phillips, 3-1/8" long 5/16" hex bit; #3 Phillips, 3-1/8" long 5/16" hex bit; 5/16" slotted, 3-1/8" long 5/16" hex bit; 3/8" slotted, 3-1/8" long 5/16" hex bit.