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Machined from solid titanium, these compact, convenient key-chain rules have crisply incised metric or Imperial graduations. Just 3/16" in diameter, each weighs less than a typical house key.

The Centipede has an 8cm scale with 2mm fine graduations and bold lines every centimetre; the Inchworm is graduated to 3" in 1/8" increments, with pronounced grooves every half inch.

Each comes in a small fitted gift box, with a split ring as well as a small spring clip for secure attachment.

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