Description:Tie tacks are made of nickel plated brass Metal material makes it anti-wear And these are incredibly sturdy and secure No tools required, the Butterfly 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 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