This Dewalt 107 piece Mixed Drill Bit Set is supplied in a TOUGH CASE+, this is part of a connectable case system that is TSTAK™ compatible. Simply clip this accessory set to the top of your existing tstak cases using the yellow side clips for your complete storage and accessory solution. Individual TOUGH CASES can be clipped together for easy transportation. Includes 6 x Extreme premium grade Flat Bits in 12, 14, 16, 20, 22, 25mm and 2 x25 25mm PZ2 Extreme Impact Torsion bits and comes in a Mini ToughCase. DeWalt Extreme Impact Torsion bits withstand the high speed and torque of Impact Drivers, so your bit can keep up with you, even under pressure The magnetic screw lock enables tasks to be completed quicker and easier, reducing instances of dropped or lost screws. DeWalt Extreme.