Ball Chain #10 Spool Aluminum 100 Feet CLEARANCE ITEM, MUST GO! #10 Aluminum 'B' Couplings are used as a connector for this chain size (sold separately) #10 size chain has a bead diameter of 3/16" (4.8mm) This is a larger more industrial size ball chain Made in USA by Ball Chain Manufacturing Since 1938. We are the manufacturer, not a reseller.