Made of finest spring steel. Cuts intricate shapes. Pin end style. No. 48575: 6 3 8″ blade, 18TPI, .018″ gauge x .090″ width, 4 blades per card, use to cut plastic and plywood No. 48576: 6 3 8″ blade, 18TPI, .020″ gauge x .090″ width, 4 blades per card, u