 
                                                 
                                            8-1/2" Mill Shoe
 
                                                 
                                            8-1/2" Core Head
 
                                                 
                                            8-1/2" Pilot PDC
 
                                                 
                                            8-1/2" HE230HU413D
 
                                                 
                                            8-1/2" JE28
 
                                                 
                                            9-1/2" DR616D
 
                                                 
                                            8-1/2" HU616D
 
                                                 
                                            8-1/2" HA516D
 
                                                 
                                            8-1/2" SP516D
 
                                                 
                                            8-3/4" SP516D
 
                                                 
                                            8-7/8" SP516D
 
                                                 
                                            


 
            