Feature:1. INTENDED USE: The metal grommets are light duty, more for decoration, can't hold heavy pulling. This grommets kit is intended for rougher applications(such as leathers, tarps, shoes, elastic band, hanging crafts, tent and canvas), not for more refined applications(such as front lace shirts, T shirt, high gloves, furniture covers), nor for materials that is too thin or too thick, recommend thickness 1mm to 3mm as the best2. STRONG WITHOUT LOOSE: The grommet inside hole size is approximately 12mm(slightly less than 1/2 inch), outside hole size is approximately 21mm(approximately 7/8 inch ). Add the washer to the grommet, which can help make eyelets stronger, and not easy to loosen3. USING TIPS: The bottom of the eyelets is a flowering design, which is not a defective effect. If applied on thin material, may have incisive ridges when finished. You can gently tap with a hammer to flatten4. PRACTICAL KIT: Grommet tool kit 12mm 1/2inch(inside hole size) included 300pcs 1/2 inch metal eyelets in silver and gold color, 300pcs matching metal washers in silver and gold color, 1 handhold eyelet punch pliers, 1 hole punch. The matching washers will help your eyelets to be stronger and less likely to come loose. You can easily use the grommet kit to make by yourself5. PORTABLE LIGHTWEIGHT HANDHELD EYELET PLIERS: These manual eyelet pliers with a special lightweight design, made of carbon steel with Cr plated, the handle of hole punch pliers is plastic impregnated, which is comfortable to grip, easy to use and effortless. Easy to take to any place. The eyelet pliers can apply the eyelets into a variety of materials such as fabric, leather, soft and thin plastic, acrylic, canvas, suede, and moreSpecification:Item Type: Grommet KitMaterial: Alloy steelEyelet Size: Approx. 12mm / 1/2in.Package List:1 x Eyelet Pliers300 x Silver Eyelets300 x Silver Grommets300 x Gold Eyelets300 x Gold Grommets1 x PunchNote:1. Please choose the right size that you need according to the product dimension description. Please pay attention to the direction of the buttonhole and the pliers, the wrong direction will cause damage to the buttonhole.2. Please confirm the size before purchasing.3. But please dont squeeze too hard, the handle will bend. The grommet kit is light duty, not for heavy duty.