GRB 777 MiniMobile Rock Crusher 580 Watt – Gold Rat. GRB 777 Mini Mobile Rock Crusher 580 Watt. 1, Backorder: more units in production Sold Out Rock Crusher for sale **Currently on Backorder since 2019 NO ETA from supplier (sorry crew) we wont be supporting this business any longer these crushers are being made overseas. .