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. DS wheels have a pearl ruby red running surface made of thermoplastic Polyurethane (TPU) in 96 Shore A directly injected on a Polyamide (PA 6) wheel centre. The wheels are with stainless steel roller bearings.