Abstract: A device for cutting sheet material includes a pair of generally flat elongated members hingedly connected together for holding sheet material to be cut and a cutting block supported for sliding movement on an upper such holding member and having an upper portion extending across the upper holding member with side portions extending downwardly from the edges of the upper holding member for guiding movement of the block longitudinally of the holding member. The cutting block includes a cutting blade affixed to one of the side portions of the block parallel to and between the side portion and the adjacent holding member longitudinal edge.