TO-199-A 7075 Hard Coated Alum.5.8mm Pivot Ball ( For Xray XB9/XB8/XB8'16/XB8E'16/GTX'17/XB8E'17/XB4'18 / XB8'19/ XB8'20/XB8E'20/XB8E'26/XB8'26 ) 2pcs.