This appears to be a hook or support bracket for a tension rod. The photo's notes indicate not to hang ropes, a weight limit of 3kg, and to turn more than half a rotation when loosening. Detailed Information: Purpose: This item seems to function as a hook/bracket to secure or support the tension rod between the rod and the wall. Usage Notes: Do not hang ropes. Weight limit is 3kg. When loosening, turn more than half a rotation. Brand: The letters "FLASTA" can be seen on the white body. Operation: Loosen by turning in the direction of the arrow "↑ ゆるむ (Loosen)". Tighten by turning in the direction of the arrow "↓ しまる (Tighten)".