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STEEL HGR25 LINEAR GUIDE RAIL: This linear rail set contains 2x HGR25 1500mm rail shafts and 4x HGH25CA blocks,16x M6*16mm flat head hex socket cap bolts,50x linear rail dust cover C6,1x allen wrench. HIGH QUALITY STEEL MATERIAL: Linear guides are made of carbon steel, linear bearings made of GCr15 bearing steel. Surface chrome plating beautiful anti-rust, hardness can as high as HRC62, more durable. HIGH QUALITY: Motor-driven guide rail achieves high precision linear motion. Designed to achieve high precision linear motion, low friction coefficient. EASY TO INSTALL: Stainless steel linear optical axis guide bearings, steel support rail with pre-drilled holes for easy installation, no need for maintenance.