Specifications: Brand: MssoommModel: SBR25The built-in material: Bearing SteelThe external material: Aluminum AlloyShaft Diameter/ Bore Size: 25mmThis item includes:2pcs SBR25UU Bearing BlocksLead Time: 7-10 Business Days except for for Chinese National Day holiday and Spring Festival, shipped by air. If you want to low cost, you could choose sea transportation, the lead time is about 45 Natural DaysFeature & Application:- Working with SBR series linear rails.- Sliding blocks to be used cooperatively with rails, smooth sliding provided by inside linear bearing.- The linear rail apply for various kinds of automated machines and equipment, can help build economical cnc linear guiding system. - Applicable for large-scale transmission equipment including industrial robots, cleaning equipment and supporting devices, etc.