This is a 1" OD Turning CNC Lathe Turning Center Turret Boring Bolt-On Block Toolholder. Not sure what CNC lathe these are for. The Okuma LFS-15 has the same bolt pattern, but the locating pin is different. See if these will fit your machine.
SPECIFICATIONS:
OD Turning Tool Capacity: 1"
Locating Key Width: 25mm
Bolt Hole Patterns: 75mm x 55mm
Overall Dimensions: 5-1/8" x 4" x 2-5/8" high
Comes exactly as shown in pictures.