The Dewalt Magnetic ToughCase Containers come in either yellow or black. Model DWMTC15 is yellow and contains 15 pieces that are geared toward driving and fastening duties. You’ll find lots of different bit heads for driving a variety of screw types. The 20 piece DWMTCIR20 is black and is geared toward drilling and impact duties. This set includes a lot of different fastener bits but also a couple of drill bits – all of which are designed to take the abuse that only an impact drill can deliver.