Contains the most popular sizes of nickel and black-coloured, nickel-plated electrical screws. Machine thread. Countersunk heads with slotted recess. Contents: Brass nickel-plated: 3.5 x 25 (50), 3.5 x 40 (55), 3.5 x 50 (55), 3.5 x 75mm (15), steel black nickel-plated: 3.5 x 25 (50), 3.5 x 40 (55), 3.5 x 50 (55) and 3.5 x 75mm (15). Raised Pan Head for a Surface Finish Carbon Steel Construction Nickel-Plated Machine Thread for a Strong Fixing Fully Threaded Excellent Clasping Power Simple Installation Contents: Brass nickel-plated: 3.5 x 25 (50), 3.5 x 40 (55), 3.5 x 50 (55), 3.5 x 75mm (15), steel black nickel-plated: 3.5 x 25 (50), 3.5 x 40 (55), 3.5 x 50 (55) and 3.5 x 75mm (15). Raised Pan Head for a Surface Finish Carbon Steel Construction Nickel-Plated Machine Thread for a Strong Fixing Fully Threaded Excellent Clasping Power Simple Installation