[ QUALITY] adjustable black design,T-nuts and thread insert are made of Carbon steel,Each leg can support 330 lbs,We have 10 pcs in a set,Usually one chair with 8 pcs is enough and the extra one can be for standby. [FLEXIBLE ADJUSTABLE] The leveling feet help to adjust the height of the furniture,1.75inch long steel insert with 3/8-16inch thread,the thread diameter is fully adjustable,strong support and adjustability for furniture [EASY INSTALLATION ] For existing furniture legs with 3 / 8 inch- 16 thread,just screw in the leg straightener to adjust the height. Alternatively,drill a 1 / 2inch hole in advance and insert the universal installation T-nut,screw in the leg straightener and adjust to the required height [MULTIPLE USES]Universal nylon base for all floors,such as hardwood / tile / carpet floors. hardwood floors with separate high-density thick felt to the floor from scratching or harsh noise [UNIVERSAL DESIGN] adjustable leg levelers can be placed on ,chairs,kitchen cabinets,,etc. No matter what help you need in your home or workplace,leg levelers is a quick repair without affecting the appearance Material:Carbon steel colour:Black Package Contents: 10 x leveling feet 10 x T nut 10 x felt pads Only the above package content,other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.