Product Description: Advantages: 1.Every product has a unique Manufacturing Part Number label on the inner package that proves it has been qualified,which include Part Number,Model Number and inspection date information 2.If you have any questions about the item,please provide us the Manufacturing Part Number for checking,your profits will be guaranteed.3.It fit for various types of electronic equipment/guide rod, drive shaft and prop4. This set includes Linear Rail Support Guide Shaft Bearing,all Bearing Pillow Block Mounted Support,Linear Ball Bearing,Motor Shaft Coupler Coupling,Screw seat Nut,Lead Screw and Linear Rail Shaft Optical Axis5.Good wear resistance and strength, high accuracy, hard to rust.6.Has good performances,low friction coefficients and long usage spans. Specifications:Color:Silver & GreyWeight:712gAccessories:4PCS SK8 Linear Rail Support Guide Shaft Bearing (8mm Inner Dia)2PCS KP08 Ball Bearing Pillow Block Mounted Support (8mm Inner Dia)4PCS D20L25 SCS8UU Linear Ball Bearing1PCS 5x8mm Motor Shaft Coupler Coupling1PCS T8 Screw seat Nut1PCS 8mm Lead Screw 8mm Dia 250mm Length2PCS 8mm Dia 200mm Length Cylinder Liner Linear Rail Shaft Optical Axis Package include:1 set x T8 Rail Shaft Support & Lead Screw Rod Set (Total 15pcs)