Brick Round Corner 4x8 Full Brick Double, LEGO® Part# 47974. Appeared in Light Bluish Gray in sets: 41072 (Naida's Spa Secret), 10669 (Turtle Lair), 9490 (Droid Escape), 7964 (Republic Frigate), 4757 (Hogwarts castle - 2nd Edition). Appeared in Dark Bluish Gray in set: 8758 (Tower of Toa).
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