This Stage Plus heavy-duty swivel castor (supplier part M-STA-W9001-V1) has a 100 mm blue wheel and is used on flight cases, road trunks, equipment racks, staging and dollies built by Stage Plus, and by case makers and technicians doing their own builds or repairs. A swivel castor rotates through 360 degrees so a loaded case can be steered easily through doorways, backstage corridors and truck ramps. The listing does not mention a brake, and Stage Plus separately lists a braked version of the same castor (M-STA-W9002-V1); a common arrangement being two braked and two unbraked castors on a case, so the case can be parked securely but still moved easily. A 100 mm wheel is a common size for road cases and racks, rolling over cables, thresholds and uneven floors while keeping the case reasonably low. The listing is for a single castor; mounting bolts or a castor dish are not specified. Stage Plus is the South African flight-case and staging brand of AV Distribution, so this is a handy spare for replacing a damaged wheel on an existing Stage Plus case.