Fangrui Product Details Specification: 100mm X 45mm X 50mm Or 4 Inch X 1.8 Inch X 2 Inch; 5/16inch (m8) Bolt Size; Weight: 0.4kg. Max Load: 50kg (110lbs); The Recommended Distance Of Each Two Isolators Is 24 Inch, E.g. 63~99 Isolators Are Needed For A Room Aera Of 215~322 Sq Ft. Easy To Install: The Base Has 1 Bolt Hole On Base For Rigid Mounting When Used For Supporting Machinery, Easy Installation On Ceilings, Floors, Walls, Ducts, Etc. Wide Application: The Can Be Used In Bedroom, Studios, Home Theaters, Houses, Hotels, Bars, Karaoke Room Etc. Can Be Mounted To Ceilings, Walls, Pumps. Colour: Black + Red Material: Plastic + Metal Package Contents: 4 * Capacity Spring Vibration Isolators Only The Above Package Content, Other Products Are Not Included. Note: Light Reflection And Different Displays May Cause The Color Of The Item In The Picture A Little Different From The Real Thing. The Measurement Allowed Error Is +/- 1-3cm.