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DC Barrel Plug Seven-Size Gauge Card
A 106 x 30 x 8 mm gauge card for sorting a drawer of unlabeled wall-warts. It has seven through-bores with lead-in chamfers, one for each DC barrel plug sleeve size from 2.5 to 6.3 mm (2.5, 3.0, 3.5, 4.0, 4.75, 5.5 and 6.3 mm OD). Each bore is printed about 0.4 mm over size, so the right plug slides in snugly, rattles in the next size up and won't enter the next size down. Recessed dots under each bore count 1 to 7. A 5.5 mm hang hole lets you keep it in the adapter bin. To tell 5.5x2.1 from 5.5x2.5, use a 2.3 mm drill shank: it fits into the 2.5 mm pin hole of the plug but not the 2.1 mm one.
Three-Bay Wall Wart Brick Shelf
A screw-to-wall or under-desk tray with three 48 x 75 mm bays, 32 mm deep walls, that holds bulky wall-wart and inline power bricks away from the power strip, so they stop covering the sockets next to them. Each bay has a front notch for the DC lead, a rear notch for the AC cord and floor vents. It mounts with two #8 (4.2 mm) wood screws through 5 mm holes in the 4 mm back wall. Overall size is 154 x 81 x 34 mm.
Flagged: mains electrical wiring. Not for safety-critical use without independent engineering review.