Description : This adjustable threaded anti - shake bed frame tool can be used for the center of gravity is unstable or easy to shake objects , such as objects against the wall like beds , cabinets , chairs and sofas . Fixed bed , prevent bed movements from squeaking and improve your sleep . Felt can effectively reduce noise and protect the wall from damage and prevent bedrock from shaking . Easy to Install , the threaded glides screw into place and can transform your bed frame in minutes , make your bed more stable . Made of alloy , firm and reliable and can withstand heavy pressure . 4 different height ranges for your needs . Specification : Material : Alloy Size : approx . Bottom Diameter : 37mm / 1 . 45inch Top Diameter : 44mm / 1 . 73inch Height : 30 - 40mm / 1 . 18 - 1 . 57inch 47 - 64mm / 1 . 85 - 2 . 52inch 64 - / 2 . 52 - 3 . 42inch 84 - 110mm / 3 . 3 - 4 . 33inch Color : Black Package Includes : 1 Piece Adjustable Threaded Bed Frame Note : 1 . Please allow 1 - 3mm error due to manual measurement , Please make sure you do not mind before you bid . 2 . The colors may be a little difference for the different monitors displays , please understand .