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It is important to choose shells with the correct opening size for your hermit crabs. The opening size you choose should be 1/8" bigger than your hermit crab's big claw. You should measure the length of the largest claw, not how wide it is.

Hermit crabs use their biggest claw as a trap door. Their claw should be recessed just inside the opening. If their big claw is down inside, the shell may be big enough or possibly a little too big depending on how deep the claw is in the opening. If the claw is too big to recede within the opening, your crab definitely needs a larger shell.

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A good rule of thumb is to buy shells with an opening that's 1/8" larger than your hermit crab's big claw.

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When ordering hermit crab shells from our site, it will say "opening" in your shopping cart.  If it doesn't say "opening" you are not ordering a hermit crab shell.  

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Hermit crab shells are essential for your pet's comfort and safety. At Naples Seashells, we offer a wide range of hermit crab shells with openings perfectly measured to fit your crabs. Properly sized shells, just 1/8" larger than their big claw, ensure your hermit crabs feel secure and protected. Browse our collection today and find the ideal hermit crab shells to keep your crabs happy and healthy. Don't settle for less; give your crabs the best!