... 5. Manual roller lifting system;6. Double-barreled framework and heavy support board. Characteristics 1. Built-in PC chips, ... reaches international level with automatic frequency tracking system and ultrasonic soft-starting technology;4. Variety of roller ... Application:Apply to lace clothing, ribbon,trim,Filter, Lacing and quilting,decoration products, handkerchief, tablecloth, curtain, bedspread, ...