Tie Tacks Blank Pins with Clutch Back - Pack of 100 - by i Craft for Less This is for a set of 100 (one-hundred) tie tacks with clutch backs The blank pad on the tack measures 10 mm and measures 9mm in length. Just attached cover buttons, cabochons, resin flowers, etc. to create one of a kind tie tacks, lapel pins or scatter pins.