About: http://webisa.webdatacommons.org/183498443

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	You want the hole to be sort of angled so the opening is wider and the bottom of the hole is about the size of your buttons.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com