Thank you for viewing. Due to stock availability, this is the shorter type. Set of 2 The tip is 17mm. These are louver clips for smartphone holders. They offer more stability than clip-on types and are recommended. If your current car mount is sagging due to vibration, or if it easily slips even when the nut on the back of the smartphone holder is tightened, the tip of the ball may be worn. This is a more economical solution than replacing the entire smartphone holder. Due to the thickness, it will be shipped in a waterproof bag and then in an envelope.