400Pcs 8-28mm Stainless Steel Watch Band Spring Bars Pins Connecting Kit With Box Watchmaker Professional Watch Repair Tools PartsFeature: . Made of stainless steel, stable and to use. Different pins, different functions, more practical.20 different sizes, 20 per size, in 20 different compartments, transparent plastic box. Specifications:Material: stainless steelTotal quantity: 400 piecesDiameter: 1.5mmSize (Approx.):8*1.5mm 20pcs9*1.5mm 20pcs10*1.5mm 20pcs11*1.5mm 20pcs12*1.5mm 20pcs13*1.5mm 20pcs14*1.5mm 20pcs15*1.5mm 20pcs16*1.5mm 20pcs17*1.5mm 20pcs18*1.5mm 20pcs19*1.5mm 20pcs20*1.5mm 20pcs21*1.5mm 20pcs22*1.5mm 20pcs23*1.5mm 20pcs24*1.5mm 20pcs25*1.5mm 20pcs26*1.5mm 20pcs28*1.5mm 20pcsPacking List:1x400 pieces stainless steel watchband connecting pins 8-28mm