Heavy duty - sturdy mechanism with great product and customer support from supplier.Although there are no instructions (which is the only thing that is a slight negative), from customer questions, customer pictures its pretty easy to fix - i can understand why they are perhaps not enclosed - because each customers bed will differ (so you have to think a little bit outside the box as to how to best suit your application - where to attach - etc.)I am just a small lady - and with a few handy power tools - i was able to transform my individual strung wooden slatted base into a fairly solid base structure by making a solid frame around the outer perimeter and some mid attachments. I did also baton out the sides of the bed to give an extra area of bite for the screws. (although from the pictures i still have one socket left to batten and screw)I fitted the metal mechanism without the pneumatic bars attached to the sides of the bed - then once attached - i arranged the side bars in a suitable position (with some resistance) to a position which would allow me to fit the pneumatic bars. Forgive me - when trying to get my head around fitting these to my slatted base - i used heavy duty duck tape and the whole of my body weight to take each strut back to its horizontal position - then secured with the duck tape (i didn't have an assistant to help me at the time!) . Then i could put my wooden frame on top and mark out the attachment holes for the long bar to base slat attachments. Perhaps this wasn't the best way - but it worked a OK for me with a bit of trial and error. You really need a heavy mattress on top to get the struts to work - they will not work with just muscle arm power.My Mattress is very heavy and with a few bits of duck tape as a temporary makeshift handle at the foot of the bed - it lifts with ease and has a very smooth operation - totally brilliant.Great customer service from the supplier - and great product too.