【1000MM HGR20 Linear Guide Rail】- This linear guide rail set includes 2 pieces of HGR20-1000mm linear guide rail, 4 blocks, 1pcs RM1605-1000mm ballscrew, 1pcs ball nut, 1pcs BF12/BK12 nut, and 1pcs plum coupling. 【HIGH-QUALITY STEEL MATERIAL】- Linear guides are made of carbon steel, linear bearings made of GCr15 bearing steel. Surface chrome plating treatment beautiful anti-rust, hardness can as high as HRC62, more durable. 【PREMIER LINEAR GUIDING SYSTEM】- Motor-driven guide rail achieves high precision linear motion. Designed to achieve high precision linear motion, low friction coefficient. 【EASY TO INSTALL】- Steel support rail with pre-drilled holes for ease of mounting. Stainless steel Linear optical axis guide bearings linear movement. Easy to install, no need for maintenance. 【WIDE APPLICATION】- The CNC linear rail is widely used in automatic equipment, precision measuring equipment, and many other machines that need precision linear movement.