brass material, it is great with punch tools. It's a good replacement for lost buttons, adding ornament to your crafts. You can add functional snaps to shirt, shower curtains, shower curtains, windbreaker, down jacket, jackets, overalls, backpacks, shoes, hats, belts, cotton-padded clothes, jeans, shower curtains, leather craft, DIY craft, etc. canvas, tarpaulins, tents, awnings, sailcloth, lawn furniture and pool covers. A storage box is included for easy classification and convenient use. Feature - Color: As shown - Material: Brass - Package Size: About 17.5 x 10 x 2.5 cm/ 6.89 x 3.93 x 0.98 inch(LxWxH) - 6 mm/ 1/ 4 inch in inside diameter, 10 mm/ 7/ 16 inch in outside diameter, 3 mm/ 1/ 8 inch in barrel length. - 150 sets/300pcs grommets and washer with 3 pieces grommet tools: a base, a punch and a setting tool. 3 Colors including gold, black, silver, 50 sets for each color, each set includes 1 eyelet and 1 washer . Almost all tools are contained to meet your different requirements. - Easy to install the grommets : The punch tool can poke a hole on leather crafts, canvas or clothing, then hammer it to push grommets together. - Good for adding ornaments to your craft and repairing clothes leather canvas. Suitable for canvas, tarps, tents, awnings, belts, garments, purses, straps, bags, shower curtains, pillows, . - Comes with an organizer storage box. The grommets and tools will be sorted out in different compartments and convenient for you to quickly find the corresponding component. - Note : Products contain small parts, please keep out of the reach of children to prevent inadvertent swallowing or other potential danger.