Feature: 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 prop 4.This set includes 2pcs Linear Rail Support Guide Shaft Bearing;2pcs Cylinder Liner Rail;2pcs Ball Bearing Pillow Block;4pcs SCS8UU Linear Bearing;1pcs D20L25 Elastic Couplings;1pcs T8 Screw seat Nut;1pcs Lead Screw 5.Good wear resistance and strength, high accuracy, hard to rust. Specification: CNBTR Material:Stainless Steel Aluminum Weight:831g Accessory: 1)2pcs Linear Rail Support Guide Shaft Bearing Product Size:42 x 32 x 11mm/1.65 x 1.26 x 0.43 Inside Diameter:8mm/0.31(Applicable to the optical axis diameter 8mm) Pacakge Size:45 x 35 x 30mm/1.77 x 1.38 x 1.18 2)2pcs Cylinder Liner Rail 8 x 300 mm Surface hard-thickness: 0.8u~3mm Hardness: HRC602 Outer diameter: 8mm or 0.314 inch Length: 300mm 3)2pcs Ball Bearing Pillow Block Bearing Internal Diameter:8mm/0.31 Bearing Outside Diameter:12mm/0.47 Bearing Width:12mm/0.47 Mount Hole Distance:37mm /1.5 Total Size:55 x 13 x 30mm/2.17 x 0.51 x 1.18(L x W x H) 4)4pcs SCS8UU Linear Bearing Inner Diameter: 8mm/0.315 Length: 34.5mm/1.36 5)1pcs 2cm x 2cm x 2.5cm D20L25 Elastic Couplings 5x8mm 6)1pcs 34x30x28mm T8 Screw seat Nut 7)1pcs Lead Screw Diameter: 8mm/0.31in Nut Diameter:22mm/0.86in Length: 350mm/13.77in Lead: 2mm/0.078in (nut revolution movement 2mm) Package include: 1 Set x T8 horizontal Shaft Support Lead Screw Rod(13pcs)