Brand may be Burndy, not 100% sure.
Uncrimped Compression Lug Terminals YA34A3 2 Hole 500 Die 300 AL9CU-HV Aluminum Connectors. Price is for each, discount applied for multiple units. Below, I have listed all the writing on the pieces for detailed identification -
YA34A3NI3ITI2E
AL9CU-HV
470-500 Y644M (2)
500 DIE 300
$35 each
Buy 5 for $100
Buy all 128 of them for $1500