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Deals damage and traps the target for 4-5 turns, dealing 1/16 of the target's maximum HP at the end of each of those turns and preventing the target from switching. If the user is holding a Grip Claw, it traps the target for 5 turns all the time. If a trapped Pokemon uses Rapid Spin, it will be freed. If the user is holding a Binding Band, the damage dealt at the end of each turn increases to 1/8 of the target's maximum HP. The target can still switch out if it is holding Shed Shell or uses Baton Pass, U-turn, or Volt Switch. This effect is not stackable or reset by using this or another partial-trapping move.
Heatran's signature move is an alternative to Fire Blast. While it has lower accuracy, the trapping side effect can be useful for cornering a troublesome opponent. The end-of-turn residual damage is also quite handy for negating Leftovers healing, and stacks quite well with sand damage.
Fire Blast is an alternative option that does not trap the opponent but is more accurate and has a chance to burn.
Wrap is a much weaker, but but more accurate equivalent.
Fire Spin is a much weaker equivalent.
Whirlpool is a much weaker Water-type equivalent.
Clamp is a much weaker Water-type equivalent.
Sand Tomb is a much weaker Ground-type equivalent.