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SHOP MADE 1 3/4 20 LEFT HAND THREAD PLUG GAGE 1.75 1.750 1.7500 L.H. INSPECTION
$39.99
https://www.mcmaster.com/product/93031A169/
93031A169 | Left-Hand-Thread Thin-Profile Hex Nut
These nuts tighten when turned to the left.
left hand threadthinprofilehexnut
https://www.answers.com/individual-sports/Which-bike-pedal-is-left-hand-thread
Which bike pedal is left hand thread? - Answers
The left pedal on a bike is typically the one with left-hand threads.
left hand threadbike pedalanswers
https://www.mcmaster.com/product/93345A231/
93345A231 | Left-Hand-Thread Coupling Nut
Pair with left-hand threaded rods, and turn to the left to tighten.
left hand threadcouplingnut
https://www.mcmaster.com/products/94450A538/
94450A538 | Left-Hand-Thread Thin-Profile Hex Nuts
These nuts tighten when turned to the left.
left hand threadthinprofilehexnuts
https://www.mcmaster.com/product/94455A610/
94455A610 | Left-Hand to Right-Hand Male Thread Adapter
Made from black-oxide steel, these adapters resist corrosion in dry environments.
left handrightmalethreadadapter