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Universal screwdriver / tool in daily life

Universal screwdriver
Universal screwdriver

This type of cross screwdriver combines three models of 7mm, 5mm and 2mm together, which satisfies the usage of general families completely.
It also highly raises the efficiency of users. They don't need to worry about finding a cross screwdriver with suitable size any more. The initial state of the cross screwdriver is 7mm. When a smaller size is necessary, you just pull out the button of screwdriver's handle; similarly, when a bigger size is needed, push the button forward.

University

Beijing University of Post and Tele

Beijing University of Post and Tele
Beijing, China

Yiyan Cao,
Beijing University of Post and Tele