... and reliability3. 4 wheels, 6 wheels, 8 wheels, 12 wheels are available4. Easy to installMaterial : 304-201 stainless steel ,America 101 NylonAvailable ... Japan,silently and glidinglyType: Door wheel , stainless steel wheel ,sliding handing wheel ,stainless steel hanging wheelOffered: 4 wheels, 6 wheels ,8 wheels, 12 ...