1pcs Diameter 10mm - 60mm Stainless Steel Screw Balls Piercing Balls Polish Ball Semi-hole with M6 Female Thread Round Balls
https://www.vogueparade.com/shopping/EN/42/1/1005003349056637/1pcs-diameter-10mm-60mm-stainless-steel-screw-balls-piercing-balls-polish-ball-semi-hole-with-m6-female-thread-round-balls//