The special stainless steel is elaborately processed and manufactured, which is very durable, compact in size and complete in function. It can be put in the pants bag without any weight. It is very suitable for students, white-collar workers and all kinds of business people to use outdoor spare tools at ordinary times, or go on business trips and camping as a carry-on tool. It can be put in a briefcase, a small bag or a schoolbag very lightly without occupying any space. Is the most useful combination of tools