Why buy just a heat sink for your Raspberry Pi 4 ,when you can buy a case that acts as a standalone heat sink!  This case will keep your Pi 4 an optimal temperature.

Reinforced aluminum material, lightweight and durable

Not for use with other heat sinks or with Pi HAT's.  Pass-throughs for Raspberry Pi Camera and Display cables are included

Includes thermal tape, screws, and an allen key for assembly 

Size:  100 x 72 x 24 mm (3.9" x 2.8" x .94")

We've had a few questions about how to apply the thermal tape, so we've added a couple images that should clear this up.