The entire box uses a formation by ABS, TPE material injecting.. It is not only non-slip grip, practical convenience but also portable and durable;. The magnetic bar can be operated under special needs;. All bits made by Cr-V steel (code 6150#), It is hardness reaches to HRC52-56 degree;. The handle shape is special ergonomic design, can disassemble according your working area's space;.