You can use these extra-long headers to add shields on the top of the Arduino. The pins on these headers are 11mm long; enough to clear the Arduino’s USB connector allowing a shield to be connected on top without mechanical interference. With this kit you get:

• 2x 8-pins headers
• 1x 6-pins header
• 1x 10-pins header
• 1x ISP programmer header

The kit is compatible with the Arduino UNO R3 and Leonardo.