The 640907-1 is a Crimp Terminal with yellow nylon (polyamide) insulator and tin-plated contact. Straight orientation, 3.31 to 5.26mm2 wire cross-section, yellow barrel, female quick disconnect type, 6.35 x 0.81mm tab size and 12 to 10AWG wire size. Terminal and the crimping tool are designed as precisely matched devices.