Lot of 17 Machinist Set Up Stepped Block Angle plate milling t slot

For sale is a Lot of 17 Machinist Set Up Stepped Block Angle plate
milling t slot
A few of them are aluminum.
2.5x3.75x2"
3.5x2x1"
2.5x1.5x1"
1.75x1x1"
2.5x1.75x2"
1.25x0.5x1"