screw-free [electro-optical silver]. 0636 anti-lost patent buckle(免螺丝款【电光银】.0636防丢专利扣) screw-free [gun black]. 0636 anti-lost patent buckle(免螺丝款【枪黑色】.0636防丢专利扣) with screws (send screwdriver + phone card) inner diameter. 19mm(螺丝款（送螺丝刀＋电话牌）内径.19mm)

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