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T-Spec Set Screw Ring Terminals (4-ga. 5/16" hole) 2-pack with 1 red and 1 black terminal at Crutchfield
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Gardner Bender 4 AWG 3/8 in. Stud Size Vinyl-Insulated Ring Terminals in Yellow (4-Pack) 15-098 - The Home Depot
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Amazon.com: Harmony Audio HA-RT4 Car Stereo Power or Ground 4 Gauge 5/16" Ring Terminal - Nickel Plated : Electronics
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