Material: made of high-quality copper, which is very smooth and shiny, has strong deformation resistance, good corrosion resistance, waterproof and rust-proof, and is particularly durable. Easy to Use: Firstly use the punch tool to cut a hole on tarpaulin, then take on the eyelet kit, finally use the fastened tool to fasten well the eyelet kit. Storage Box: Grommet setting tool comes with a plastic storage box, which is convenient to organize and store various small buttonhole tools, which can save space and keep the tool room tidy Size: Metal fabric eyelets inner diameter is 12mm, outer diameter is 20mm Non-Slip Design: The punching tool surface has a unique pattern, which is non-slip and provides a more secure grip, and the grommet can be easily snapped into place with the matching punching tool and clamping tool.