Metal tube (aluminum?) on a keyring, with some o-rings strung on

Men Metal Leather Keychain Key Chain Ring Keyfob Car Keyring

Half circle, with a spike, metal, probably vintage in the kitchen

O Ring ø 15 - 38 mm, Gray

Light, colored pattern cloth covered tube with a string connecting 2 odd metal parts on either end. : r/whatisthisthing

Red plastic handle with attached small/normal ziptie, possibly left in house by workmen : r/whatisthisthing

Lucky Line 5” Twisty Lock Key Ring, Flexible Nylon Coated Steel Wire Loop, Corrosion-Resistant and Durable, 1 Pack

O Ring ø 45 - 50 mm, Stainless Steel

Metal wrapped glass cylinders. Has a hard black substance on the closed end. Found in a middle school's science room. : r/whatisthisthing

QUANTITY – Paxcoo split rings come with totally 200 pieces metal key rings that will meet your needs for daily use or craft projects. SIZE – The split

PAXCOO 200Pcs Split Key Rings Bulk for Keychain and Crafts, 1 inch (25mm)

HEAT TREATED KEY CHAINS- We Only Source From the Best Hardware Manufacturers with The Most Stringent Compliance Standards SUPER HARD SUPER STRONG

25 Pack - Extra Large Key Rings - 1.25 Inch Heat Treated - Heavy Duty Sturdy Metal Split Ring Keychains by Specialist ID

Corrosion-resistant and waterproof: 5 In length strong and flexible, corrosion-resistant cable key ring that is built to last. Use for binder rings,

Lucky Line 5” Twisty Lock Key Ring, Flexible Nylon Coated Steel Wire Loop, Corrosion-Resistant and Durable, Blue, 5 Pack (8113005)

3ft tall aluminum cone with interior threaded flange (mysteriously