Britool 12 Piece Whitworth Combination Spanners Sizes. 1/8, 3/16, 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 7/8. Part numbers RJ338, RJ445, RJ525, RJ600, RJ710, RJ820, RJ920, RJ1100, RJ1200, RJ1300, RJ1480. Used but many as new all straight in good used but abused condition all the same pattern.