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M4*8 - 304 Stainless Steel Ball Screw Ball Head Spring Plunger Steel Ball Tight Positioning Ball, Find Details and Price about Screw Ball Inner Hexangular Set Screw from M4*8 - 304 Stainless Steel Ball Screw Ball Head Spring Plunger Steel Ball Tight Positioning Ball - Dongguan Zhongyixin Hardware Mould Co., Ltd.