Features:_x000D_ _x000D_ The shell is made of metal, durable for use. _x000D_ Standard processing makes the product has high interchangeability. _x000D_ The inside slide block is a high precision liner bear. _x000D_ Surface oxidation treatment, beautiful, and rust-proof. _x000D_ High accurate and stable performance. _x000D_ _x000D_ Specifications:_x000D_ Material: Metal _x000D_ Type: Slide guide rail_x000D_ Slide track: Linear guide rail_x000D_ Rated dynamic load: 860N_x000D_ Rated Static load: 1370N_x000D_ Accuracy level: H_x000D_ Screw size(not included): hex socket screw M4(linear bearing rail), hex socket screw M5(block bearing)_x000D_ Allowable static torque: 1 kn.m_x000D_ Weight: 2364g_x000D_ _x000D_ Package List:_x000D_ 2 x SBR12-600mm Linear Bearing Rail_x000D_ 4 x SBR12UU Slide Block