When choosing the right fully insulated female spade connector, it is essential to take into account the wire size (mm or AWG) and also the tab size to which it will be connected. The width of the receptacle should match the width of the tab, and also the thickness from the tabs may vary. Common tab sizes include .110 (2.8mm), .187 (4.8mm), .205 (5.2mm), .250 (6.3mm), and .375 (9.5mm). Proper selection ensures a secure and reliable electrical connection.