JACK SCREWS -How To Use- Adjustable support that accepts a tip on top. -Technical Information- Load Capacity(N): 2600N, 3900N, 5900N, 11000N, 18000N -Material- Body: S45C steel, Black oxide finish -Datasheet- https://www.imao.co.jp/files/on-cat/pdf/en/bj332-e.pdf