Automatic Center Punch - No Hammer Needed Solid Brass Make precision center marks in wood, metal, composites, fiberglass, vinyl and fiberboard Use for precision nail, screw placement or setting drill bits Push handle down to fire punch - strong inner spring mechanism works without hammer or mallet blow Special alloy steel tip indents even hardened metal surfaces; solid brass body with non-slip grip Easy-to-use 5 inch length x 1/2 inch diameter; 1 inch tip