Features Interchangeability: Straight slider sports bearings are treated with standard treatment, which makes the product highly interchangeable and has a stable and reliable structure. High Accurate and Stable Performance: Straight slider block has stable performance, high reliability, lightweight and delicate shape, which can satisfy our use well. Easy to Carry and Store: Straight slider sports bearings are strictly made in accordance with standards, with reliability and high accuracy, small size, easy to carry and store, easy to use. Smooth and Flat Surface: The surface of the straight slider has smooth and flat characteristics, beautiful appearance, and excellent workmanship. It is a very useful tool. Strong and Durable: The shell of the slider sports bearings is made of metal materials. It has the characteristics of sturdy and durable. It is a very practical tool. Features: 1.The shell is made of metal, durable for use. 2.Standard processing makes the product has high interchangeability. 3.The inside slide block is a high precise liner bear. 4.Surface oxidation treatment, beautiful, and rust-proof. 5.High accurate and stable performance. Specifications: Model:Size(Approx.)Installation Screw Size(not included)Weight SBR10UU 36 x 32mm / 1.4 x 1.3inM567g SBR12UU 39 x 40mm / 1.5 x 1.6inM593g SBR16UU 45 x 45mm / 1.8  x 1.8inM5143g SBR20UU 50 x 48mm / 2.0 x 1.9inM6185g Material: Metal Package List: 1 x Slide Block Package List 1 x Slide Block