These fit both thicknesses/depths of unistrut from big box stores. They are half the cost but work great. Only time will tell if coating is as good. The 5 count spring nut product in bags at store are meant for industrial applications. So who knows if these would standup to harsh chemicals but I am using these in my basement for table and shelving so not a super hazardous chemical warehouse with OSHA etc - thus not my concern. I used almost all one hundred count and not one issue with threads not being good or one being to thick to slide in narrower channel. I will buy more of these at this price point. Really great value for price compared to price of 5 in a bag at store. If you don't think you'll use a hundred - you will!