Solid Carbide Twist Drill A\ - Manufacturing standard: DIN 6537 - Chisel edge grinding: TOOTOOL standard - Tolerance of cutting edge diameter: m7 - Chip evacuation flute special designed, easy evacuation HA DIN 6535 mm Dc 8xD 12 xD Designation dl 15 mm inch Lc 12 II Lc 12 II DCl..- 16.000A16S-C 16.0 16 136 152 204 192 208 260 48 16.500A18S-C 16.5 18 153 171 223 216 234 285 48 17.000A18S-C 17.0 18 153 171 223 216 234 285 48 17.500A18S-C 17.5 18 153 171 223 216 234 285 48 18.000A18S-C 18.0 18 153 171 223 216 234 285 48 18.500A20S-C 18.5 20 170 171 244 238 258 310 50 19.000A 20S-C 19.0 20 170 190 244 238 258 310 50 19.050A 20S-C 19.05 3/4" 20 170 190 244 238 258 310 50 19.500A20S-C 19.5 20 170 190 244 238 258 310 50 20.000A20S-C 20.0 20 170 190 244 238 258 310 50 771 772