flat head insert nut 1.High quality 2.high precision, 3.excellent reliability. material option:1.Bearing ... roller, soft tread3. low-noise operation4. High quality roller bearing 5. with a high load-bearing capacity6. suitable for countless applications ... to clients.Payment: TT, western union Transportation: EXW,FOBApplication: metal wheels, sports equipment, furniture,machinery and equipment, toys, ...