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Yes. The Klar is listed as a 1 handed weapon. 1 handed weapons can be used in 2 hands to get 1.5x STR and 3:1 on Power Attack.
However, Kintrik is also correct in the description of the Klar says that it's like making a shield bash with Armor spikes.
Setting aside the misleading language of "Armor spikes", a shield bash with a light shield is like attacking with a light weapon. So it wouldn't get the benefit of 1.5x STR, but in Pathfinder it still gets the 3:1 on Power Attackif I recall.... Unless it's an off-hand attack.