Right and left; both sides. '左右' is the more common expression in daily use, though '右左' may appear in writing.
旗の左右（右左）を確認してから掲揚してください。
Please check the flag's left and right sides (right and left) before hoisting it.
道に迷って、右左どちらに進むべきか相談した。
I got lost and discussed whether to go right or left.
彼は右左両方を自在に使える作業員だ。
He is a worker who can use both his right and left hands skillfully.