The archaic bronze craft knife shaped in the form of curved dagger, one end with tapering tip, and other end with a stringing hole, body hollowed near the base, used for scraping words from scriptures.|Warring States period.||Length: 7 1/2 in (19.1 cm)|銅削刀|削刀，用來削除簡牘上的字，以便改正重寫。《釋名•釋兵》：“書刀，給書簡有所刊削之刀也。封刀、鉸刀、削刀，皆隨時用作名也。” 畢沅 疏證：“削刀即書刀。”書刀就是刮製簡冊與刪改錯字的工具。