For creating a broad variety of shapes in wire and metal strips. An invaluable tool when forming consistently sized links. Four 6 mm diameter steel pins are placed in various holes within the aluminum block according to the shape you wish to create. The block also has 4 straight slots of different widths along with one radiused end and one triangular end. Mounts to your work table with 2 wood screws (included) or placed in a bench vise. Dimensions: 4 ⁷⁄₁₆" long x 1 ¹⁄₃₂" wide x ⁵⁄₈" high.