Kaiser 25-33mm .98-1.3" Twin Boring Head 314.205 25-33 CCMT 21.51 Carbide Insert #2

25-33 insert cartridges can bore in the above-mentioned range and can take any CCxx 0602xx 21.5x carbide inserts, such as CCMT CCMX CCGT 060202 060204 21.51 21.52 and possibly others

Not a lot to say, it looks to be in nearly perfect shape.