Wu Tseng-tung says that at first they always made knives from the shrapnel of the bombs from the 1958 attack. The bombs used in that battle had deadly explosive charges, and the fragments they left behind saved the trouble of cutting apart larger pieces.
吳增棟表示，最初製刀都是用八二三炮戰時的砲彈碎片，因該戰役的砲彈都屬殺傷力強的爆炸型彈頭，以碎片製刀可以省去切割的麻煩。