RS PRO Brass Male/Female Spacer & Standoff Kit Spacer, M3, Body Shape: Hex, Number of Pieces: 450, Finish: Nickel Plated, Body Length Longest: 30mm, Body Length Shortest: 5mm.
RS PRO Brass Female/Female Spacer & Standoff Kit Spacer, M3, M4, Body Shape: Hex, Number of Pieces: 450, Finish: Nickel Plated, Body Length Longest: 40mm, Body Length Shortest: 6mm.