Corn size: metal corns 1/4 inch inner diameter, 1/2 inch outer diameter, 1/4 inch barrel length, you can easily repair it yourself with a corn kit; please confirm the size before purchasing Easy to operate: The hole punch is designed to be good in hand, flexible, easy to use, can reduce hand pressure, very easy to use, multi-functional; you need to punch holes with a punch tool before you can use buttonholes and pliers; note Orientation of buttonholes and pliers, wrong direction can cause buttonhole damage PACKAGE INCLUDED: This handy grommet kit includes a punching tool, 100 gold + 100 silver grommets, plenty enough for your needs Convenient and practical: The one-piece punching pliers are made of steel, the surface is chrome-plated, the PVC handle is dipped in plastic, and the 6.6-inch metal pliers can be placed directly after being pressed into the hole, which is simple and convenient Reminder: The bottom of the hole is a fancy design, no need for a washer; after pressing with a hole punch, the bottom will bend naturally; please refer to the fourth part of the fourth picture