I first bought 10 pairs 14" long to create my own storage. The boxes are wide (26 inches) and hold about 30-40 pounds each. These films are ideal for this. There is a little side to side wobble when fully extended but within my tolerance. I bought another set of 10 to complete the 8ft storage space which also holds quite a bit of weight. Again no problem. My final opinion is that they offer unbeatable value for money. I've used 14 pairs - no problems with any of them. If you are not careful when reattaching the drawers after unzipping, be careful not to accidentally land on the ball cage as this will deform them and potentially loosen the ball bearings. If you find the drawers difficult to pull out after installation, most likely your drawer is too wide - user error! If you pull the drawer back out after re-engaging the slide and find that the drawers don't slide all the way back, simply push harder and slide the drawer all the way in. This will set the ball bearing carriage in the correct position, after which the box will slide normally. This is only necessary occasionally when you open the drawer to remove it. Yes, and the screws are included. These are 1/2" chipboard screws that are great for 1/2" drawers. The plywood I used was only 0.4" thick (10mm layer) and the screw was marginally long and broke through in a few boxes. User error again.
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