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 best 2、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 loosen 3、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 flatten 4、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 yourself 5、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 more