Various combinations: grommet kit set includes hole cutter, matching mandrel and 100 sets of grommet eyelets (each set includes 1 grommet and 1 washer), and storage box Eyelet Pouch: Provide an economical solution for repairing canvas, tarps, tents and pool covers, good for shoes/laces, clothing, craft projects etc Easy to use: easy to set the eyelets of the eyelets in place with the hole cutter and the paired mandrel; The chuck has a distinctive pattern on the surface, anti-slip provides more secure grips Grommet size: inner hole diameter 12mm (1/2 inch), outer flange diameter 4 /5 inch and 1/5 inch barrel length With plastic storage box: approx. 14.5 x 8.5 x 3.3 cm. ideal for storing small eyelets, easy to tie in and apply when sewing Product Details Product Name: 12mm Air Eye. Size: inner diameter 12 mm Material: Brass Tools: 3 tools (punch is black punch) Color: silver Contents: 100 sets of air eyes + 3 tools + storage box Quantity: 100 sets Weight: about 320g Storage box size: 14.5 x 8.5 x 3.3 cm. Uses: folders, tents, banners, yacht canvas, etc. Number of pieces delivered: 100 pieces