Applicable Series:The link rod parts for HX6300 / HX6500 /HX6700 /HX6900 /HX8900 /HX9100 /HX9300 series electric toothbrush. Applicable Models:The electric toothbrush metal shaft/vibrating tip replacement parts compatible with for HX6210 HX6710 HX6720 HX6730 HX6750 HX6760 HX6910 HX6920 HX6930 HX6950 HX6960 HX6970 HX6310 HX6320 HX6511 HX6340 HX6530 HX8910 HX9140 HX9150 HX9160 HX9340 HX9350 HX9360 HX9370. Essencial Replacement Parts:How do I know if I need to replace the metal shaft part for my toothbrush? The metal shaft (vibrating tip) is covered by rubber seal. In most cases, if this part comes out easily from the base or when you feel the bad vibration while brushing your teeth, or your brush-head seems loosen and can't rotate properly, then you might need to replace the metal shaft connector block. Universal link rod parts:The replacement metal shaft link rod parts are generally interchangeable. For example, if this parts compatible with the HX6910 it should fit all HX6900 series models such as the HX6920, HX6930, HX6950 HX6960 HX6970 and so on. Accurate HX number is marked on the bottom of your toothbrush handle. Color: As shown Material: Metal+Plastic Note: Due to different batches, the appearance and label text may be slightly different, but it will not affect the use Package Contents: 1 x Electric Toothbrush Link Rod Parts 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.