Modern picture frames are joined with V Nails (Wedges) with a machine often referred to as a underpinner or simply a V Nailer. This is a superior method of joining picture frames providing greater strength of joint especially in wide picture frame mouldings whilst not needing any filling, puttying or touching up to the external edge of the picture frame as a result of older methods of joining with nails. The first V Nailer was designed by Antoine Cassese in 1976 and revolutionised the way picture frames have been assembled since.
picture framing v nails

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