Zinus Metal King 9" Smart Box Spring

Updated August 6, 2026

est.MSRP: $197 Condition: NEW- Brand: Zinus Model: ZU-ABS-9KS UPC: 841550325423 As the backbone for solid mattress support, a box spring that falls short can make or break your night's sleep. We developed the Smart BoxSpring with unbeatable durability and rock-solid stability to keep your mattress in shape for years to come. And our latest quick assembly version gives you total confidence when it comes to setup, requiring fewer bolts and ingeniously designed with easy to use, tool-free brackets. With our simple, step-by-step instructions on hand, you'll have this foundation built and ready to use within minutes. Built with a strong and durable steel frame and a versatile poly jacquard cover that slips right on, the Smart BoxSpring is the picture of dependability for any mattress. All packed in a compact shipping box with everything included. Made of high-quality steel for durability. Features a weight capacity of 700 lbs. Includes essential parts and instructions for easy setup. STRONG, DEPENDABLE, AND READY IN NO TIME - As if its ultra-durable steel structure and convenient packaging weren't impressive enough, our original Smart BoxSpring has been given a quick-assembly upgrade. DURABLY ENGINEERED - Durable steel is used to construct the inside framework of this foundation; twin/twin xl sizes support a maximum weight capacity of 350 lbs., while all other sizes can support up to 700 lbs. EASIER THAN EVER ASSEMBLY - With fewer bolts and tool-free locking brackets for intuitive setup, assembly takes only minutes to complete. THOUGHTFULLY PACKAGED - All parts and instructions are packed into one compact box that ships straight to your door. Steel interior frame with poly jacquard. Color Family: Gray. Furniture Features: Slats Included. Material: Metal. Product Weight (lb.): 51.8 lb. Size: King. Total Weight Capacity (lb.): 700 lb. Product Depth (in.): 78.7 in. Product Height (in.): 9 in. Product Width (in.): 75.5 in.

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