These have Super Heavy Duty Bulkheads. Will not loosen up like other units.

REMOTE BNC to BNC KIT FOR Shure, Sennheiser, Audio Technica, Samson, and all ANTENNAS using BNC Connectors.

FOR ALL WIRELESS SYSTEMS - MIC'S AND IN EARS USING BNC CONNECTORS 

WITH 4  Male BNC TO Male BNC RG-58, 50 Ohm 20" CABLES, 1U RACKMOUNT, 4 BNC TO BNC PANEL MOUNT CONNECTORS. COMPLETELY ASSEMBLED