The Atlas No. 3 Spade Tongue Solderless Connectors are handy small U-shaped connectors used to hook up wires to a variety of Atlas and similar electrical switches, turnouts and accessories with screw terminals. They're designed for AWG 18-22 gauge wire and No. 3 screw posts. Maximum width is .218". Each pack has 24 connectors. Spade Tongue Solderless Connectors are part of the line of Atlas 150 electrical accessories and lighting.