The '020' indicates 20 positions per row, for a total of 40 pins in this 2-row connector. The '07.0' specifies a 7mm lead style or mated stacking height. The '-L' denotes a plating specification of 10µ" selective gold in the contact area with matte tin on the tail. The '-DV' indicates a dual vertical mounting style. The '-K' signifies a pick and place pad. The '-TR' specifies Tape & Reel packaging. The ERF8 series identifies a 0.80 mm pitch Edge Rate® Rugged High-Speed Socket Strip connector from Samtec.