Facom Angled Open-Socket Wrench
(75 series) - deep recess at one end and open end socket at the
other fit over protruding studs (6-point, both ends). The angle
and through hole design accommodates threaded rods or a bar for
extra leverage without affecting wrench strength. This is one of
my favorite Facom products for field installations (cabinets,
shelving, garage door track, etc).