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 Color: Black Package Includes: 3 Piece Adjustable Threaded Bed Frame (1x 30-40mm, 2x 47-64mm) 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.