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- Compatible With Car Speaker And Amplifier Terminals: Fits M4 binding posts, subwoofer terminal cups, and common barrier strips for secure audio connections. - Precise Fit: M4 thread with 8 mm screw length and 8 x 8 mm square washer to clamp spade or ring lugs and maintain strong electrical contact. - Durable Build: Zinc-plated iron with color zinc passivation resists oxidation in humid cabins and garages; smooth threads help resist loosening from vibration. - Versatile Use: Ideal for car door speaker installs, lost hardware replacement, custom subwoofer box builds, and bench testing in home audio workspaces. - Easy Installation: Place the square washer under the lug, start by hand, then tighten with a driver; do not overtighten.