About: http://webisa.webdatacommons.org/61494847

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	These types of screws are an important fastening feature in mechanical systems where metal surfaces rub together and cannot be obstructed by screw or bolt heads, such as in pulleys and gears.
http://www.w3.org/ns/prov#wasQuotedFrom	wisegeek.com