These four casters are the easiest for heavy items. This model is hard to find used, so I recommend it. - Brand: PELICAN - Model: 0340 CASE - Material: Plastic - Color: Beige - Handle: Folding 【Product Specifications】 ● Internal Dimensions: 45.7 x 45.7 x 45.7 cm ● External Dimensions: 52.1 x 52.1 x 48.9 cm ● Weight: 13.5 kg ● Buoyancy: 100 kg Thank you. P.S. The casters were recently replaced.