Electric Trolling Motors,Outboard Trolling Motor,Electric Outboard Trolling Motor,Trolling Motor For Inflatable Boat Ningbo Haishu Hongkang Outdoor Industry & Trade Co., Ltd , https://www.hktrollingmotors.com The blasting block degree refers to the geometric size of the rock fragments after blasting. The maximum distance between the ends of the common rock ore is indicated. Where the block size meets the requirements for the size of the inlet of the shoving equipment container or the chute and the first crushing equipment, it is a qualified block. Any ore that has a block size exceeding the required block size is collectively called a large block.