Blum21 Inch Undermount Drawer Slide. (Soft Close, Full Extension, Concealed). Model: 563F5330B (100 Lbs. Weight Capacity), for 3/4 inch Thick Drawers. (Pair)

I watched a lot of YouTube videos on how to install these. There are a lot of suggestions out there. I have one cabinet that has four different drawer sizes stacked, and the cabinet is only 18 inches wide. Countertops were already installed when I decided to buy these, so getting inside the cabinet Was nearly impossible. To solve the problem, I ended up, taking all the drawers out, cutting two pieces of one by three an inch less than the height of the floor of the cabinet to the countertop, please sing it in front and just behind the cabinet face with the four drawer holes and tracing the bottom left and right corners of where the drawers go. I compensated a quarter of an inch and attached the back L brackets before screwing the one by threes vertically into the back of the cabinets. I pre-drilled and started three drywall screws in the wood, then place them vertically at the back of the cabinet. This meant I only had to screw in six screws at the back of the cabinet. Worked beautifully. Didn’t see the suggestion on any of the websites I checked. I then screwed the glides into the bottom corners of the face after slipping them onto the L brackets. Every single, one of them worked, all of my drawers are aligned perfectly and the mechanism that screws into the bottom of the drawers to help a line are fantastic. Very happy with this product, they are expensive but they are worth it if you want soft closed drawers. My drawers are now full extension, quiet and work perfectly. My husband and I installed about 15 pair in two days.

I loved how sturdy these slides looked compared to the ones I was replacing. These slides were also very quiet. I even contemplated spending more money to replace the other slides I have but they are not yet broken and these were already a pricey replacement. But I really did pay the premium for the quality slides I now have. This is a great product and the installation was easy because it was a replacement of an under mount drawer slide. This was 1/2” larger when I measured but came up to the same size as my previous drawer slides. Will buy again if needed!

Good instructions and a well made product.

Slides work well and are very smooth. Easy to install.

You can count on products made by Blum

THEY ARE EXPENSIVE BUT WORTH IT. TAKE YOUR TIME PUT THEM IN PERFECT AND YOU WILL LOVE THEM

The other 1.5 pairs had issues. Still great quality for the price. Still bought more and will be returning the pairs that had some problems.Problems: one slide of one of the pairs was not smooth. It shuttered like a bad bearing or something when moving In and out without and with wieght. The other 0.5 is one pair wouldn't always retract fully. Would slowly stop 5mm or so short, having to push it a bit more to shut fully.Overall though, these are super nice and easy to adjust.9/10 satisfaction

I have built several cabinets with these and have had no problems. They are worth trying just check there web site and figure which ones will work for you.