About: http://webisa.webdatacommons.org/7985232

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	The externally threaded sections 158 of retainer screws 160 are threaded into the inserts and serve to secure the mounting ring sections 139 and 146 in friction retention with an optical sighting device or other object.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com