Abstract: The present invention relates to a fastener for mounting an object to structure having a C-shaped channel having a slot and flanges on either side thereof, the fastener comprising a bolt having a head sized to pass through the channel slot and a washer comprising a washer hole, the washer being configured to pivot about an axis substantially perpendicular to the shank of the bolt when the bolt extends therethrough, wherein the washer is pivotable between an insertion configuration, such that a bolt head and the washer may be inserted into the slot of the C-shaped channel and an engaging configuration, wherein the washer engages with the channel flanges, preventing withdrawal of the fastener from the channel.