Hi-Max Riveted #60 Roller Chain Single Pin D-1 Attachment 3/4" Pitch 21'

New Surplus.
Attachment Chain sections with master links, 8 sections 31"L each.
#60, 3/4" Pitch.
D-1 Single Pin Attachment, Every other link on one side only.  
15/64" Dia x 9/16" Pin Length.