Hex Standoff Length Gauge Rack
A 124 x 28 x 28 mm staircase rack that sorts AND measures female-female hex standoffs: eight columns with pockets at 5, 6, 8, 10, 12, 15, 20 and 25 mm, all pocket floors on one plane so a standoff sitting flush with the rim is that length, proud is longer, sunk is shorter. Front lane bores are 7.0 mm (M2.5/M3 hex at 5.0-5.5 mm across flats, plus round spacers), rear lane 8.6 mm (M4 hex at 7 mm across flats), with 5 mm scale grooves down both sides and two 3.4 mm M3 clearance holes to screw it to a shelf or bench.
organizer standoff spacer electronics