I do a few things to target arms! Tricep dips for a start- using a step or the sofa. Then I get the tins, start with them down by your side and raise your arms out to the sides, palms (and tins) facing down and repeat. It kind of looks like your flapping. Sounds easy- try it and see!
Then arms out to the sides, palms facing up, draw your elbows in to your hips and repeat. To me, this feels like it gets biceps but in a different way to bicep curls.
I try do 20 of each, in two lots of 10. The flapping one gets your shoulders/back fat too lol