Eyelet Punch Includes 30 gold eyelets [Uses] Reinforcement and repair of holes in cardboard, cloth, vinyl, leather, and other materials. I used it to create name cards for my wedding. It was easy to use! The following information is based on the product website. [Specifications] ● Eyelet hole diameter: Approximately 4.0mm ● Maximum installation thickness: Approximately 2.0mm ● Pilot hole size: 5.0mm ● Grip color: Yellow [Set Contents/Accessories] ● Accessories: 5mm eyelets x 30 [Materials] ● Body: Nickel-plated Thank you for viewing.