OlyLog®, a product of Olympic Manufacturing
Group, was the first threaded log home fastener
which required no predrilling. It is used in log
home construction to fasten logs togther in a
vertical wall, as an alternative to bolts and
other fastening methods.
Some characteristics of the OlyLog® are:
Drills right through all species of logs
Self countersinking head design
Removable: Just put the drill in reverse
and back it out