are these the size of a rifle round

They are too small. the inside dimensions are 1/2 by 1 7/8. they will hold a .45 acp or smaller but not a .308 winchester. They will fit 6 small round shaped ibuprofen or 3 or 4 capsule shaped tylenol or 5 ML of liquid benadryl but that is about it.

I want to use these to test aquarium water. Can they be washed and reused?

I am not 100% sure as they are not glass. I assume that if you are using chlorine or other harsh chemicals, they may be absorbed into the material these are made from. I would suggest glass just to be on the safe side. I use these for fountain pen ink and some inks stain and even with household bleach and D**n soap any new ink I put into the washed vial has a smell of the chlorine bleach. I am not familiar with how the process for you works, but I would not myself reuse them only because of my experience. Hope this helps.

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50Pcs 5ml Plastic Graduated Vial Sample Bottle Container with Blue Caps

Product ID: 71962708

📏Precise 5ml capacity

🔵Secure blue screw caps

🧪Clear graduated markings

A$18

Duties & taxes included

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Sold byAmazon AustraliaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔬 Elevate your lab game with precision and style!

COMPACT PORTABLE - Slim 15x60mm size fits neatly into any lab rack or storage.
SECURE SCREW CAP DESIGN - Leak-proof blue caps protect your samples with confidence.
BULK PACK FOR EFFICIENCY - 50 durable vials to keep your workflow uninterrupted.
VERSATILE STORAGE SOLUTION - Ideal for solids, powders, and liquids—adapt to any lab need.
PRECISION SAMPLING MADE EASY - Clear graduated scale ensures exact measurements every time.

This set of 50 plastic graduated vials features a 5ml capacity with clear measurement markings and secure blue screw caps, designed for accurate sampling and versatile storage of solids, powders, and liquids in professional or industrial lab settings.

Specifications

ASIN	B07FFSYVW4
Best Sellers Rank	#29,402 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #46 in Lab Sample Vials
Date First Available	July 12, 2018
Item Weight	5.6 ounces
Item model number	02-059-013
Manufacturer	Eowpower
Package Dimensions	7.6 x 4.92 x 2.48 inches

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The customer service exceeded my expectations. Perfect for buying products you can't find elsewhere.

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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