Housing without collar, made of machined hardened steel.
Bottom internal thread for fixing with screws or threaded rods.
Machined steel top cap.
Felt seal.*
Available in steel, zinc plated steel, stainless steel.
Balls made of chrome steel, AISI 420 stainless steel or plastic.
* Except for SBM 12, SBM 15 and versions with main plastic ball.