Features: This slide unit has a closed type Aluminum housing, a housing with the flat mounting face and four tapped bolt holes. The ball bearing slide block is great for you to replace the damaged one in your devices to improve them efficiency and save energy. Linear bearing slide bushing is widely used in food, power tools, sports equipment, carpentry Industrial standard slide block, features high accuracy, high stability. Smooth moving, low friction, high rigidity and long life. Economical, easy to maintain replace. Specifications: Ball Bearing Model: SCS12UU Material: aluminum, steel ball Inner Diameter: 12mm / 0.47inch Overall Size: 36 x 42 x 28mm / 1.4" x 1.7" x 1.1"(L*W*H) Weight: 359g Package Included: 4 x Linear Motion Ball Bearing Slide Unit