The female header part is about 8.5mm tall, good for small HATs that do not to clear the USB/Ethernet jacks. This header has 3mm of pins / extra long 10mm pins. 

With 3mm you don't have to cut the really long pins, so its ideal for basic Pi HAT design

With 10mm you can have a HAT that has extra pins to stack another HAT on top!

You'll get one header per order.

Note: The Raspberry Pi Model A+, Raspberry Pi 2, Pi 3 are also compatible with this product!

Specifications:

• 2x20 Pins
  
• Dimensions: 5mm x 51mm x 12mm / 0.2" x 2" x 0.5"
• Pins: 3mm
• Pin Spacing: 2.5mm / 0.1"
• Pin Thickness: 0.6mm / 0.2"
• Weight: 3.56g
• Extra-long 2x20 Pins
• Dimensions: 5mm x 51mm x 19mm / 0.2" x 2" x 0.7"
• Pin Length: 10mm
• Pin Spacing: 2.5mm / 0.1"
• Pin Thickness: 0.6mm / 0.02"
• Weight: 4.1g

Documents:

• 2x20 Pin Datasheet
• Extra long 2x20 Pin Datasheet

• Warranty will not apply if Product fails or is damaged after delivery to you due to accident, abuse or misuse.

Package Includes:

• 1 x Adafruit 2222 / 2223 GPIO Header for Raspberry Pi A+/B+/Pi 2/Pi 3 - 2x20 Female Header