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=== Centre finder head === [[File:Combination_square_centre_finder_head_diagram.png|thumb|Labelled diagram of the centre finder head with a circle as an example]] The centre finder head can be used for: * Marking lines through the centre of circular or square objects, such as [[Dowel|dowels]]. Making multiple marks at different angles can be used to identify the point at the centre of the circle. * Marking lines perpendicular to a curved edge ([[Normal (geometry)|normal lines]]). * [[Bisection|Bisecting]] square corners to mark a 45Β° angle.<ref name=":3" />
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