Adafruit's Black Plated M/F Brass Standoffs are engineered specifically to keep your Pi HAT snug on your Pi while also keeping the two boards separated, in particular the HDMI port. These standoffs can also be screwed into each other allowing stacking multiple HATs on to one Pi! They're the perfect companion for any Pi Hat combo. Each order comes with two standoffs and two hex nuts. Weight: (One Standoff) 2g. M2.5 screw size (both ends)