These freedom runners work great. I make cabinets, dressers, tables and other furniture for people who want better quality than what you buy in the store and for people who want to make their furniture more personal. So I go through a lot of these ball bearing drawer slides. When I started I tried many different brands of ball bearing drawer slides but settled on them for various reasons. These slides are of high quality and offer good performance for the price. They always match the quality. This means I don't have to worry about missing screws or bent rails when I buy them, unlike some other brands I've used. A major deciding factor in making these slides my choice is that they are available in all sizes and even with soft close slides at the 2 home warehouses in my city where I usually buy them. The only reason I ordered them from Amazon this time is because I need them to finish garage cabinets I built for a client. Someone had bought all the 16 inch drawer slides from the warehouses near me and therefore didn't have any in stock. I highly recommend them, but again, I prefer them. There are many other brands. Reading some of the reviews some people don't like these slides but I have used literally hundreds of these slides over the years and never had a problem with them other than my own installation errors. The best way to install these slides is to ignore the instructions that come with them. The instructions that accompany these slides only complicate the installation. Using the center line is the best and quickest way to install it. How I usually do it. I measure 1 1/2 inches from the bottom of the box and use a ruler to mark a line across the box at those marks. It doesn't matter how wide you measure your box as long as you remember the number because you will need it. I then line up the center of the mounting holes with that line and fasten the guides in place. On the piece itself, I measure from the top of the cabinet to the depth of my drawers plus the space I want between the edge of the cabinet and the top of the drawer. Then peel off the number you used when installing the slide on the drawer itself and mark it. For example. Remember I measured 1 1/2 inches from the bottom of the box. Let's say my drawer is 6 inches deep and I want the top of the drawer to be 1/4 inch from the edge of the cabinet. So I measure 6 1/4 inches from the edge, then subtract 1 1/2 inches from 6 1/4 so I have 4 3/4. So I make a mark at 4 3/4. Using a square or ruler, I draw a line from the mark and align the center of the rail's mounting holes to that mark and fasten. This method ensures that the guides are set quickly and accurately every time. This method also works well when measured from the bottom of the cabinet. It's even easier to measure from the bottom of the cabinet. Determine how much clearance you want between the bottom of the drawer and the bottom of the cabinet. Add the distance you want from the bottom of the cabinet to the bottom of the drawer to the measurement you used for the drawer itself. Then measure this distance from the bottom of the cabinet and make a mark. So, like before, I set the center of the rail on the drawer 1 1/2 inches from the bottom of the drawer. Let's say I need 1/8 inch clearance between the bottom of my drawer and the bottom of my closet. I'm going to add 1/8 to 1 1/2. I give myself 1 5/8. So I measure 1 5/8 from the bottom of the case. Use a square and straight edge to draw a line. Align the center of the mounting holes back to the line and fasten. It always works. If you want to build a lot of boxes, use these slides. Think of a standard spacing that you will use when mounting drawer slides. So does the drawer have a depth of 3 inches or 9 inches? Use the same distance from the bottom of the box. It only gives you one size which is always the same when you install the drawer slide on the cabinet. Much easier than always trying to account for the different sizes of the box itself.