English to Portuguese Tech/Engineering Aerospace / Aviation / Space parts of the fuselage

Locate necessary shop aids and tools necessary to accomplish removal and balancing of the
ruddervators using a force measurement method. Recommended tools are as follows:
(...)
(g) Triple beam balance scale with certification less than one year old.
(h) Two ***knife-edge supports***. Local manufacture from aluminum angle material is permissible.
(i) Two C-clamps for securing the ***knife-edge supports***.

I wonder if those are angled supports?

Thanks!