This Chapman Tools 25 bit set comes with Phillips, Slotted, SAE and Metric MM Hex Bits, and a 2" Extension. This case is expandable and customizable with open stock bits and bit racks . The CM-13 mini ratchet is rated at 200" lbs of torque, which is the typical torque of 4 large screwdrivers. Most bits are rated at less than 200" lbs based on the torque of the screws they fit. FeaturesPrecision milled to tight tolerances with flat edges, sharp corners & no burrs for snug screw fitMachined from USA steel & heat treated with a black oxide rust inhibitor finishBits are engineered to bend/break BEFORE damaging the screw they fit Each bit has ears/ring stops with ball detent to hold the bit securely in our toolsBits have knurled ends for finger tightening & are stamped with the part #Non-magnetic for use on electronics & PC boards