300pcs 30 Sizes 1.5-1.8mm Japan Waterproof Mini O-ring Kit for Watch Crown Seal

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300pcs 30 Sizes 1.5-1.8mm Japan Waterproof Mini O-ring Kit for Watch Crown Seal
Inner Diameter: 1.5-1.8mm
10pcs for each size, 30 sizes for each box, total 300pcs/set