Dual Coil 1.7 Ohm Stainless Steel Tank Replacement Cartomizers will fit 510 Cartomizer Tank. These have the metal flange and come pre-drilled (one hole) so you will not have to punch. Tolerance is +/-0.2 Ω
See voltage chart below for which type to use.
1.25 ohm: Use with eGo battery
1.5 Ohm: Use with eGo battery
1.7 ohm: Use with eGo battery
2.0 ohm - 5 Volts
2.5 ohm - 6 Volts
3.0 ohm - 7.4 Volts