Enables GTPase activator activity. Involved in positive regulation of GTPase activity. Acts upstream of or within actin filament organization; focal adhesion assembly; and regulation of GTPase activity. Located in actin cytoskeleton. Used to study microphthalmia. Orthologous to human ARHGAP6 (Rho GTPase activating protein 6). [provided by Alliance of Genome Resources, Apr 2022]