Chisel no1applying:1.The length of moil point for penumatic hammer of G7,Website:http://www.nbydtools.com,G10,G11,G12,G20,G30,etc. are 250-1500mm2.Pick brazing is a direct contact and work tools, size and shape on the gas picks has remarkable effect on the productivity of pick brazing shape and length depending on the breakdown of the seam hardness, such as seam the more hard the more short picks brazing, long conversely. Soft seam with crack or the mine is using length of 300-300 - mm, hard and toughening of the seam, use 150-300 mm.