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Shelf Pin Hole Size Gauge Paddle
A 110 x 30 mm pocket gauge for older bookcases and cabinets. It has seven chamfered test pegs (4, 5, 6, 6.35 (1/4 in), 7, 8 and 9 mm) that you push into a shelf-pin hole to find its real size. Below them is a matching row of through-holes (printed 0.2 mm over nominal) for checking a spare pin before you buy or print replacements. A V-notch on the edge marks the 1/4 in peg so you can tell it apart from the 6 mm one, and a 6 mm hole lets you hang it on a pegboard.
32 mm Shelf Pin Drilling Jig
A 148 mm self-registering drilling jig for the European 32 mm shelf-pin system: five 5.4 mm guide bores on exact 32 mm centres, 13 mm deep for bit alignment, held 37 mm from the panel edge by an 8 mm deep hook fence. Leapfrog it down a cabinet side by dropping a 5 mm shelf pin through the end bore into the last hole you drilled; two 4.5 mm M4 holes let you screw it to a backer board or wooden fence extension.