These Scale Pans in 75mmD are used for weighing in labs, experiments, and industries. They hold objects securely with hooks or cords. A. Plastic w/chain & hook: Features a sturdy plastic construction and a strong hook, using the same design as pulley sheaves. The pan is secured to the hook by 3x miniature chains. B. Nylon one piece with hook: Low cost scale pan made of black moldable Nylon. Its sides are hinged for a strong hook and there are no loose or breakable parts. C. Brass / Aluminum with cord and hook: With 3 holes for attaching cords or chains. Ideal for general purpose weighing or carrying weights for experiments, such as Hooke’s Law, in school laboratories. Brand: IEC Product Code Material Descriptions Dims (dia x depth) Manual SE.MF3720-001 Plastic w/chain & hook 75x12mm 0.01 kg SE.MF3723-001 Nylon one piece w/hook 100x12mm 0.01 kg See Here SE.MF3721-001 Brass w/cord & hook 75x12mm 0.01 kg See Here SE.MF3722-001 Aluminum w/cord & hook 75x12mm 0.03 kg See Here