The simple design of the snap attaching tools leaves the "guesswork" behind. The three-part tool literally "snaps" fasteners into place with the aide of a household hammer. Includes the size 16 adapter; additional adapters allow customers to accommodate a larger snap top. The curvature of the adapters cradle the snap head to prevent crushing or cracking. The post on the tool snaps out enabling you to set a snap anywhere on the garment.