UNIVERSAL FIT - Our bed rails are designed for king size bed, queen bed, twin, full size bed and more. Toddler side rails are suitable for standard mattresses up to 12 inches thick.

This particular model is designed to accommodate a king-size bed — rail lengths can be adjusted without tools to 37 inches, 43 inches or 57 inches, and the crossbar adjusts from 36 inches to 72 ...

Best King Size Bed Frame Deals: Save up to $200 on Tempur-Pedic king size bed bases (TempurPedic.com) Save up to 60% on king size bed frames, foundation & platform beds (Walmart.com) ...