HRLK series strong pressed steel, zinc-plated, blue-passivated, Cr6-freedouble ball bearing in the swivel head swivel head seal minimum swivel head play and smooth rolling characteristic and increased service life due to the special dynamic Blickle riveting process steel truck lock with rubber pad height adjustment with lever Wheel: POG series high-quality nylon 6, hardness 70 Shore D, color gray Other features: high chemical resistance to many aggressive substances operating temperature: -20 °C to +80 °C, reduced load capacity over +35 °C