MINIATURE JACKS -Technical Information- Load Capacity(N): 3600N, 6500N, 10400N, 15100N, 28200N, 44100N -Materials- Body: S45C steel, Quenched and tempered, Black oxide finish, Heat treated to Rc33-39 -Datasheet- https://www.imao.co.jp/files/on-cat/pdf/en/bj331-e.pdf