Polaris AL4N 4 AWG Al Compression Lug, 1/2 IN 2 Hole, 1-3/4 IN Spacing
https://nsiindustries.com/product/4-awg-al-compression-lug-1-2-2-hole/
Provides reliable termination for copper code or aluminum conductors in switchgear, panelboards, and power distribution equipment. Two mounting holes with NEMA spacing provide secure mounting and alignment.