I have designed two cabinets with six drawers in one and four in the other for use in my woodworking workshop. They had to be "durable" for frequent, long-term use, plus I wanted the drawers to slide out far enough to access the full depth of their length. The drawer size was 22"X22" in one and 16"X22" in the other so they needed 18" slides. Luckily I found these drawers in a box of ten at one of the best prices I've found online or Found at a local retailer. Institutions. They proved to be of very good quality, precisely constructed and just right for the standard half inch side rail spacing. All ten drawers work well and appear solid so I am completely satisfied with the product. All the hardware is expensive these days, but the price and quality is above average in this package so I recommend it to buyers.