The C Mount with Vampire Clip holds in place many different types of round and rectangular lavalier mics that measure between 5.5mm and up to 7mm in diameter: Sennheiser ME 2, Sony ECM 77, DPA 4061/4071, Tram TR50, Sonotrim and Oscar Tech 801/802, and more.  Mic head diameters less than 5.5mm can be used in conjunction with double stick tape but the firm gripping properties of the mount are not as effective, especially with the vampire clip option.  The vampire clip is designed to pin the mount directly onto fabric. 

The C Mount with Vampire Clip is used for microphone mounting and isolation from fabric or skin for optimal sound quality and made of flexible rubber material can be used hundreds of times.