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Concave Hammer / Hammer aids for nails

Concave Hammer
Concave Hammer

1.This hammer can effectively prevent the hands from injuring when you are nailing something.
2.The Contact area of the hammer and nail can be controlled by the concave part of the hammer.
3.There are two hammer heads which can shift with each other via thread, and one of the hammer heads is placed on the handle of hammer while the other is for normal use.

University

Shandong University

Shandong University
Ji'nan, China

Shunxin Li,
Shandong University

Zixuan Zhang,
Shandong University