Altitude Equipment is an Australian firm that made some interesting plastic nuts starting in 1998. Sadly, these colorful pieces failed to attract climbers, and disappeared from the climbing scene.
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↑ Set 529-531: Altitude Equipment Poly Hexes #9–#11
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↑ 529: Altitude Equipment Poly Hex #9: 45, 49, 62 mm.
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↑ 530: Altitude Equipment Poly Hex #10: 55, 60, 74 mm.
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↑ 531: Altitude Equipment Poly Hex #11: 69, 75, 90 mm.