The Black Diamond 128 PC Punch and Eyelet Set is a versatile kit for punching clean holes and setting hardware in materials like leather, vinyl, and other flexible sheet goods. It includes punch diameters of 2.5, 3, 3.5, 4, 4.5, and 5 mm, along with one heavy duty leather punch, one heavy duty eyelet pliers, and one heavy duty press stud pliers to handle common repair and craft tasks. Made with durable carbon-steel components and supplied with 100 pieces plus 25 press studs, this set keeps the essential tools and hardware together for consistent results in the shop or at home.