This model is used to secure a ring. It is shaped so that a ring with a diamond can be stored inside. When the carabiner clip is attached – the rings cannot be removed. The hole in which the carabiner clip is inserted has a 5mm (.20 in) diameter. An additional document will be included in the .zip file that gives more information on best settings when printing this model and any other necessary information. Any questions before or after download can be sent to ask.rich.3d@gmail.com.