Adjustable 8-12 inch bed legs Metal Replacement Heavy Duty Leg M8 M10 Thread (Set of 6) Support Leg for Adjustable Bed Frame, Sofa, Cupboard, Desk Yireehome adjustable bed legs match most adjustable bed frames. First, measure the thread size on your bed frame legs. If it is M8 or M10, it will fit. Measurement tip without a ruler: Use the width of an Apple Lightning cable’s connector head (about 8mm) as a reference. If the thread matches this width, it is likely M8; if slightly thicker, it may be M10. For precise results, measure the thread’s outer diameter with a ruler.