All KeySmarts come with a free loop piece to attach any car keys, fobs, or other larger accessories. We also recommend purchasing a MagConnect or Quick Disconnect which allows you to easily disconnect your KeySmart from your car keys.
KeySmart will fit almost any flat key. The posts are 4mm in diameter. We don't recommend putting large, plastic covered car keys inside the KeySmart because they do not glide easily. These keys can be attached to the loop piece that comes with each KeySmart.