Those are the same as or at least closely related to quadrex, xeno, or "terminal" (as in "wiring terminal") bits. I have them in two sizes, both bits and insula

Those are the same as or at least closely related to quadrex, xeno, or "terminal" (as in "wiring terminal") bits. I have them in two sizes, both bits and insulated handles. I find I never use them as just sticking a #1 Robertson in there (despite my being American) does everything I could want.