Proxxon 28747 spiral scroll saw blades, without pin, are designed for cutting in all directions and obviate the turning of the work piece. This is advantageous, especially with bigger work pieces. A 1/16-Inch hole is required. The 5-Inch blade comes in a pack of 12 each spiral scroll saw blades. Blades are made of high quality steel for extended use. The 28747 5-Inch blades are designed for use with plastics and hard and soft woods.