Description:Tie tacks are made of plated brass. Metal material makes it anti-wear. And these are incredibly sturdy and secure.No tools required, the for Butterfly for clutch with spring fastener slices allow you to install and remove it easily. Great for pins keeps a tight hold on them.Allow you to install and remove it easily, handy and convenient for useGreat for badges, tie, hat and various fixingsThe blank pins and for clutch back can be applied to tie tacks, badge, service bars, name tag, toy pins, jewelry making, DIY crafts, etc.Specification:Material: BrassSize of pin: Approx. 4.5 x 8 mm / 0.18 x 0.31 inchSize of clasp: Approx. 11.5 x 6 mm / 0.45 x 0.24 inchPackage Includes:50 Sets Lapel Clasps Fasteners