For Raspberry Pi / Arduino or other development boards, the diameter of the installation holes on the board and the Pin Header hight have a great limit for their installation with expansion board or case. But with this M2.5 / M3 Hex Spacer/ Stainless Steel Screw / Nuts, you could DIY your project as you wish and it can do great help to Realize the idea of your genius!
Popular Size: As a reason of Raspberry pi hat design: GPIO Pin connection (Expansion board) is about 11 mm high and the screw hole diameter is 2.75 mm, this spacer & screw & nuts pack is a perfect installation tool for Raspberry Pi 4/ Raspberry Pi 3 model B+ / 3B / 2B /B+.
As user's need, Add 4 x M2.5x12+6mm spacer. More stander standoffs(spacers), more useful.(it is free!)
Brass Hex Standoff/ Stainless Steel Screw / Nuts Assorted Kit;
Screw thread: M2.5/(2.5mm), thread pitch: about 0.45mm;
Male end thread length: 6mm;
124Pcs/Lot. Come with the plastic box;
Easy to install and durable to use;
Compatible with Raspberry Pi 4/ Raspberry Pi 3 B+ / Raspberry Pi 3 Model B / Raspberry Pi 2 Model B / B+/Raspberry Pi Zero W
4 x M2.5x12+6mm Spacers(updation)
30 x M2.5 x 5mm Screws
30 x M2.5 Nuts
15 x M2.5x5 +5mm Spacers
15 x M2.5x11mm Spacers
15 x M2.5x11+6mm Spacers
15 x M2.5x20+6mm Spacers
Note: The above numbers behind M are for spacer/screw/nut tooth diameter x length,the unit is mm. Example: M2.5 x 5mm Screws.