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'The probe section is about 3.5" (9cm) long and is 0.75" (2cm) in diameter when closed. When opened the prongs spread to a maximum of 2" (5cm) apart which is enough of a spread to do damage to some people (hence the need for extreme caution). Once the desired spread is achieved the speculum can be locked open by turning an adjustment screw on the front of the device.These are stainless steel medical examination devices intended for anal spreading. They are solid and well-made.We sell these items as a collectors pieces or novelty items. Do not use them for anal spreading unless you know how to use them safely and carefully.'