The screwless pushbutton devices are said to ensure horizontal entry of solid or stranded #20-18-awg wire and feature stainless-steel integrated springs for firm wire retention. These modular blocks can interlock to a maximum of 24 units and mount into predrilled or stamped holes. They provide brass, tinplated terminations with stainless-steel contacts. The blocks have current ratings to 10 A, dielectric strength of 2,500 V, and operating temperatures of 22 to 248°F.