You need two. Jay -An iPhone communication- On Jun 1, 2011, at 2:11 PM, "Heard Saxon" <heard at datatrontech.net> wrote: > Can someone please send me a pic of the battery clamp in action? I have the > clamp and one J-bolt but I have no idea what holds the other side. It looks > like it needs 2 J-bolts, but the catalogs say 1.