Manfrotto or Benro half bowl/ball adaptor have 3 screws for locking head?

analogs

Well-known member
Does anyone know if the half ball adaptors of Manfrotto 520 or Benro 75 have those 3 screws on the half bowl that you tighten to lock the head into place onto the half bowl. I find the head always loosens when I mount a head to a slider and I pan.

I am wondering if these half bowls have the screws that prevent heads from loosening.

Thanks
 
Thanks David, so they come standard. I don't understand why they do not place this info in their description??
 
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