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When you need to break the blade of your utility knife, you just need to pull out the sheath of the tail part and put the blade into the sheath. The sheath can be bent, so when you press the handle of the knife, the blade will be broken inside the sheath. This kind of utility knife is safer and can save effort.
Quan Qiuyun, Zou Liangping,Ma Meng,Gao Xuanting