VERSATILE MULTI-BIT SET: Impact-rated screwdriver and nut driver set includes a handle, 39 standard bits, 4 nut drivers and 1/4-Inch bit holder MODbox MODULAR CASE: All components fit in the compact case, which connects to other compatible Klein cases and the MODbox case adapter rail attachment for effortless organization KLEIN KNECT: Adapters allow bits and sockets to seamlessly change from hand drivers, impact drivers to pass through wrenches with Klein's KNECT system IMPACT RATED: Sockets and bits are all impact rated for use with an impact driver INDUSTRIAL STRENGTH BITS: System comes with an assortment of Phillips, slotted, square, TORX, combo, and hex screwdriver bits and 4 nut drivers for multifaceted applications INTERCHANGEABLE: Be ready for any job by easily switching out various bits in the set CUSHION-GRIP HANDLE: Offers greater comfort and torque while fastening