Polaris L25038B CMP Lug Cu Long 250 MCM 3/8 Bolt-Bell
https://testing.nsiindustries.com/product/250-mcm-3-8-1-hole-copper-long-lug-yellow-bell-end/
The POLARIS compression design creates a permanent, vibration-resistant connection that you can rely on with low contact resistance. Suitable for a wide range of applications, including power distribution, grounding and data transmission.