Inside BOP is a special tool used to quick cannect with drill tools when blow out is happened in dirrilling operation. Advantages: High bearing pressure, reliable sealing, blowing out releasing, easy operation, quick switch.OD mm ID mm Thread connection Length (in) 3 3/8~33/4 11/2 23/8IF 26 4 1/8~41/4 13/4 27/8IF 28-30 4 3/4~51/4 2 31/2IF 30-31 6 1/4~63/4 21/2 4”IF 33-34 6 3/8~7 213/16 41/2”IF 33--34 7~71/2 213/16 51/2”FH 33--34 8” 213/16 65/8”REG 34 91/2~ 213/16 75/8”REG 34 Type Mandrel O.D. (mm) Max. O.D of blade extension (mm) Min O.D of blade extension (mm) Thread type Total length (mm) GX114 92 111 92 2 3/8 REG 880 GX127 103 121 103 2 3/8REG 880 GX140 110 133 115 NC31 1000 GX146 110 139 121 NC31 1000 GX168 130 162 137 3 1/2REG 1150 GX178 136 170 146 3 1/2REG 1150 GX194 136 186 162 3 1/2REG 1200 GX219 142 212 185 4 1/2REG 1400 GX245 200 238 210 4 1/2REG 1500 GX273 228 268 237 6 5/8REG 1500
