Self tapping collar screw 3780620 with 1/4 inches hexagonal head and Phillips PH2 recess, dimensions 3.5 x 25 mm (set of 100) Drill point. Single thread. Fully threaded. Suitable for sheet steel, maximum 2x1.5 mm Material: Hardened, electroplated steel Works well together with magnetic sockets TST-V 9x100 and TST-V 10x45, and long Phillips bits PH 2x110, in confined spaces