The Brother Bias Tape Binding Set for Serger is designed to simplify the process of attaching bias tape to your projects. For 6mm (approximately 1/4”) bias tape, use the small bias tape sliding plate with the LC2 presser foot. For 12mm (approximately 1/2”) bias tape, use the large bias tape sliding plate with the LC1 presser foot, which is included with your CoverStitch machine. This set ensures clean, professional-looking results when applying bias tape to fabric edges.