3 inch in length, use with heavyweight material like wool, leather, canvas, vinyl & upholstery Great for laundry bags, crafting, kilts, keys, blankets, wrap skirts/kilts, securing mattress pads in place & dozens of other uses at home, work and school Practicable, they can pin quilts together for a warmer cover and also can pin scarf to keep it from slipping off Package included: 30pcs Heavy Duty Safety Pins