Used in Gear shaft, motor shaft, short support shaft, shaft pocket model, miniature axle, model plane, model ship, model cars etc Package included: 3pcs 2mm brass rods 3pcs 2.5mm brass rods 3pcs 3mm brass rods 3pcs 4mm brass rods 2pcs 5mm brass rods 2pcs 6mm brass rods 2pcs 8mm brass rods Total: 18pcs Please allow 0.1-0.5mm error due to manual measurement. Note: the product are small parts, keep away from children and kids