Our floor-mounted (Pro-Set) high back lavatory supports are fabricated with epoxy-coated heavy gauge steel uprights welded to pre-drilled steel bases. Adjustable coated cast iron sleeves are tightened around the uprights when height specifications are met. These sleeves are internally threaded to accept horizontal adjustment of the threaded arms and arm lock nuts. To ensure that the lavatory is solidly affixed to the concealed support arms, our Sure-set locking device easily adjusts from underneath the lavatory to grip the lavatory's inner wall while levelling screws ensure a precise installation.