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Screw hole lathe toolholder bushings (sometimes called J bushings) have holes for set screws to secure the cutting tool shaft and provide positive cutting edge alignment.
| Bushing Type | Screw Hole |
| Inside Diameter | 1 in |
| Outside Diameter | 1-3/4 in |
| Set Screw Hole Diameter | 7/8 in |
| Set Screw Center-to-Head | 3/4 in |
| Set Screw Center-to-Center Distance | 1-1/4 in |