Plastic Sheet, Board & PanelChina 18mm 19mm 20mm 21mm 22mm 23mm Grade G100-G1000 Material AISI 1010/1015/Q235 Solid Loose Carbon Steel Balls for Furniture Rail Roller Pulley Slingshot Slide Rail, Find details about China Steel Ball, Carbon Steel Ball from 18mm 19mm 20mm 21mm 22mm 23mm Grade G100-G1000 Material AISI 1010/1015/Q235 Solid Loose Carbon Steel Balls for Furniture Rail Roller Pulley Slingshot Slide Rail