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: SPOG series high-quality nylon 6, impact resistant, hardness 70 Shore D, extremely robust heavy-duty version, color gray Other features: high chemical resistance to many aggressive substances operating temperature: -20 °C to +80 °C, reduced load capacity over +35 °C