EK End Sections for SNK SeriesEnd sections for SNK series PI-Spring terminal blocks.SNK Series PI-Spring Terminal BlocksPI-Spring technology provides a Smart Connection and the benefits of 2 technologies in 1 connection:1. 50% faster connection time with Push-In mode (direct insertion - for stranded wire with ferrule or for solid wire, use screwdriver to remove wire).2. Reduced effort and conductor preparation time with Spring-Mode (use screwdriver to insert and remove non-prepared stranded wires).