Chisel no2applying:1. The length of chisels for chipping hammer C4,Website:http://www.nbydtools.com,C6,C7 are 300-1200mm.Checking and handling of pick brazing1, pick soldering tip should be sharp, drill rear flat no gap and drill perpendicularto the central axis;2, drill steel shank with pneumatic picks the right firm;3, the need to obtain enough solder and spare soldering of transcription;4, pick tip stuck, but rocker pneumatic picks or picks around the tip of coal and rock back and forth, pulled out after loosening;5, dull pick tip in time lost