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Ridge-Spine Desk Letter Opener
A 160 mm letter opener that prints flat. It has a 24 x 9 mm grooved thumb handle, a hang hole for a 6 mm peg or hook, and a 94 mm blade that tapers to a 0.6 mm slitting edge on both sides. A tapered bolster stiffens the blade where it meets the handle. It slits envelopes cleanly without a metal blade on the desk, and it doesn't depend on any hardware.
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