This OLFA replacement blade pack is sized for 60 mm rotary cutters used for long cuts on heavier quilting and craft materials including fabric, leather, and upholstery. The set includes five 60 mm (2.36 in) blades so you can refresh the cutting edge as projects demand for production cutting and frequent changes. Change blades with the cutter locked, keep unused blades covered to protect edges, and dispose used blades securely.