For existing Grip Base M1 customers, optional "12-24 Tripod Screw Set for Grip Base M1" which consists of two sets of 12-24 Tripod Screw and 12-24 Tripod Screw Spacer, is available.
*For an Ikelite housing which has 12-24 UNC size screw holes of 76mm/3in center to center distance on its base, modified Grip Base M1 shipped after March 2012 is necessary. The Grip Base M1 shipped before March 2012 is not compatible.
