[CR]ID mystery chainring bolts

(Example: Framebuilding:Paint)

Date: Mon, 05 Feb 2007 20:37:21 -0600
From: "John Thompson" <john@os2.dhs.org>
To: CR List <classicrendezvous@bikelist.org>
Subject: [CR]ID mystery chainring bolts

Whilst rooting through some of my old boxes today I came across some chainring bolts I can't identify:

http://www.os2.dhs.org/~john/mystery-bolts.jpg

There's a 13mm nut on one side, which threads into a sleeve with a 4mm Allen socket on the other side. What type of crank uses them?

--
John Thompson (john@os2.dhs.org)
Appleton WI USA