Abstract: A member such as a board (10) configured to interlock with similar such boards, typically for use as flooring. The board (10) comprises an elongate body (11) having first and second opposed faces (13, 15) and two longitudinal sides (17, 19). A first locking portion (12) is provided at one longitudinal side (17) and a second locking portion (22) is provided at the other longitudinal side (19). The first locking portion (21) comprises a tongue (23) presenting a convex face (33), and the second locking portion (22) comprises a groove (41) for receiving the tongue (23) of a similar board disposed adjacent thereto. The groove (41) has a face incorporating a concave portion (49) for receiving the convex face (33) of the tongue (23), whereby interaction between the convex and concave portions (33, 49) serves to draw the tongue (23) of one board into the groove (41) of another board upon relative angular movement between the two boards towards a position whereby they are in side-by-side relation.