Oyaide INS-BD Black Diamond Hematite stone insulator

For placing inside of Oyaide's INS-BS which is a small chrome plated brass footer (35 mm diameter and 15 mm in height) with a recessed hole on one side, and a carbon fibre disc on the other side. The recessed hole accepts the INS-BD Black diamond , just place the black diamond insulator inside the INS-BS. SETS OF 4