This is an 1-1/4 ID Boring CNC Lathe Turning Center Turret Boring Bolt-On Block Toolholder. Holder came off of a Hwacheon Hi-Eco 10 CNC Lathe. ID Boring Tool Capacity: 1-1/4. Locating Key Width: 30mm. Bolt Hole Pattern: 85mm x 45mm. Overall Dimensions: 3-3/8″ x 4-3/8″ x 3 high. Comes exactly as shown in pictures.