PH2 AND T25 BIT PACK: 20-Piece set consists of Phillips #2 and TORX 25 1-Inch bits to have readily on hand PROFLEX TORSION ZONE: Energy-absorbing design to reduce torsional stress, extending bit life and improving impact performance S2 STEEL BITS: Impact-rated construction built specifically for high-torque screw driving applications with power tools COMPACT STORAGE CASE: Ultra-slim profile fits tool pouches, pockets, and storage bins to be easily carried along with a bit set MODBOX COMPATIBLE: Back latch extends to connect to larger Klein Tools MODbox cases as well as connect to other slim-storage cases