Bluemoona 20 Pcs - Copper Vintage Locking Tie Tac Tack Pin Guard Clutch Backs Chain Findings 10mm 3/8" Pad Pins (Nickel) Material: BRASS Color:Nickel Quantity: 20 Pcs(with Pin) Pins Size: 9MM Post x 4.5MM bar :20 mm (13/16") chain: 36 mm (1 7/16") Perfect for lapel pins, scatter pins, hat pins, collar pins, badges, rank pins and more