Check the base and the widest point
Read the shape and the dimensions together.
Look at the part that stays outside
For any toy intended for anal insertion, choose a design with a broad flared base or a retrieval feature that prevents it slipping inside. Look at the profile and base photos together. If the base or grip is unclear, ask the maker for an underside photo and dimensions. See Planned Parenthood’s toy safety guide.
Tell depth from width
Overall length can include the handle, neck or controls. Insertable length and the widest insertable diameter answer different questions. Treat an unqualified width as an overall measurement until the maker says otherwise.
Identify the silhouette first
A tapered plug, a graduated probe and a curved model can differ at the widest point even when the overall lengths match. Compare the base, neck and widest section before looking at how many modes it offers.