the cooling cutting and lubricating fluid to pass by the drill bit holder 10 and bypass a 34 sonde 34 device 20 which is located inside the drill bit holder the 34 sonde 34 device is a commercially available transmitter used for locating an underground drill bit those skilled the art will recognize that prior art solutions to drill bit holders have flooded the 34 sonde 34 and the flooding has shortened the life of the 34 sonde 34 the apparatus of the invention provides a cooling channel 50 which traverses the drill bit holder from the drill shaft mounting end 14 to the drill shoe opening 12 where the fluid exits port 52 the cooling channel travels down the side wall of the drill bit holder 10 and exits at port 52 where the cooling cutting and lubricating fluid flows on the drill bit 30 the drill bit 30 is inserted in drill shoe opening 12 in the operation of the drill holder of the apparatus of truck mounted boring of the invention the drill is inserted along insertion lines 31 into the shoe of the drill bit holder 12 thus the invention provides a mechanism which the 34 sonde 34 transmitter 20 can transmit without being immersed in the cooling cutting and.