Ecraft 3/8 Inch(10Mm) Grommet Press Handheld Puncher Plier Kits Eyelet Hole Effortless with the help of the double level structure. you can operation and press the gromment tool by only one hand. Magnetic dies fix the eyelet and washer accurately without the possibility of falling out, applied with durable high purity metal for a longer life span.This manual eyelet puncher matches up 3/8"(10mm) inner diameter eyelets with 300pcs eyelets included. A pilot hole is not required. It punches the hole and mounts the grommet at the same time, plus the ergonomics of the handle makes it very comfortable. If the top and bottom dies of the press did not line up properly, align them by adjusting the screws. It can be used for PVC banners, tarpaulin, garments, bag, cardboard, tents, canvas, awning, curtains and case, etc. Do not work on fabric or towels and other very thin materials. If the material you put the gromment tool in is too thin, you can get double thickness on the thin material cover vinyl. Otherwise there is a risk of tearing and ripping.