Keyhole saw
NARROW SAW USED FOR CUTTING CURVES
Drywall saw; Lock saw; Pad saw; Drywall router; Padsaw; Alligator saw; Jab saw
A keyhole saw (also called a pad saw, alligator saw, jab saw or drywall saw) is a long, narrow saw used for cutting small, often awkward features in various building materials. There are typically two varieties of keyhole saw: the fixed blade type and the retractable blade type.