Great Compatibility - 2000 sets of #0 type grommets feature 1/4' (6mm) hole size (ID), 1/2' (12mm) outer diameter (OD) and 1/4' (6mm) height, very good compatible with our manual grommet press Durable Material Made of iron for strength and resistance to deformation, with a smooth brass-plated finish for some rust/corrosion resistance, for enhanced rust protection, choose our solid brass Self-Piercing Design - Place a grommet in the upper die of the machine and a washer in the lower die, with a single press, they pierce and clinch together, forming a secure eyelet in materials up to Multi-Usage - Applied for setting on canvas, tarp, denim, leather, PVC cloth, fabric, kraft paper, applicable for banners, signs, posters, labels, awnings, tents, curtains, swatch book, string tie Package Content - The product includes 1 pack of grommets (2000 pieces) and 1 pack of washers (2000 pieces)