Homdock Heavy Duty 9 Inch Innovative Box Spring/Strong Steel Structure Mattress Foundation/Easy Assembly by 16 Screws/Twin XL

Great sturdy box spring, easy instructions, fit fine in my king frame, also the quality of the material was out standing, in fact I'm ordering 2 more XL twins for another king, I would totally recommend this product

The box springs were too large to fit a king size bed frame. We thought it might just be our frame so we bought a second frame and the box springs still did not fit. Also when the order arrived one of the covers was very large so we had to wait 3-4 days for another cover and also for pins to put the frame together. This might work fine for a twin bed but two are too large for a king

Buying two of these for king bed set saved me $200