The LM-A-2 1/4 X 20 adapter converts any mount or pedestal with a 17mm ball to a 5mm stud making the mount compatible with the Icom IC-706, IC-7100, IC-2820, ID-4100. You will need the Icom remote head bracket for this attachment to work. It is not included with this part. This mount is compatible with the LM-105, LM-200, LM-505, LM-803, LM-1001, LM-Edge mounts.