Ball coupler AK 300, suitable for all overrun devices up to 2300 kg (with AL-KO up to 3000 kg) with horizontal or cross-drilled holes. Soft-Dock protects against scratches and serious damage to the bumper in the event of collisions. Safety Compact. The stable anti-theft-advice AL-KO Safety Compact together with the AL-KO Safety Ball protects against quick unauthorized coupling and uncoupling of your trailer.