Stainless Steel Swivel Castors with single bolt hole in material quality 1.4301. Swivel head with double ball race. The top plate with single bolt hole is directly riveted to the fork to ensure smooth movement with minimal tolerances in the swivel head. The series RI is suitable for manually moved loads up to 300 kg. KN series wheels are die casted one piece wheels made of high quality Polyamide PA 6 in natural color (white). The wheels are available with plain bearing. Polyamide 6 is suitable for applications for a temperature range of -40° up to +90°C. All wheel axles are bolted in the stainless steel version.