[ 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 protect the floor from scratching or harsh noise [UNIVERSAL DESIGN] adjustable leg levelers can be placed on tables, chairs, kitchen cabinets, plant racks, 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 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.