Polaris L400N-381 400 MCM Cu Compression Lug, 3/8 IN 2 Hole, 1-3/4 IN Spacing
https://nsiindustries.com/product/400-mcm-cu-compression-lug-3-8-2-hole-1-spacing/
Provides reliable termination for copper conductors in switchgear, panelboards, and power distribution equipment. Two mounting holes provide secure mounting and alignment.