Brand Name: DUOJI Material: Carbon Steel Size: M1 M1.2 M1.4 M1.5 M1.6 M1.7 M2 M2.2 M2.3 M2.5 M2.6 M3 M3.5 M4 Length: 3mm 3.5mm 4mm 5mm 6mm 7mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm