Extra Large Cutting Broaches 7mm–10.5mm Clock Repair Winding Arbor Bushing Tool

A set of four extra large five-sided cutting broaches in sizes that are difficult to find on the open market. While most broach sets only go up to 4mm, this set covers the 7mm to 10.5mm range — the sizes needed for winding arbor bushing work on longcase, wall, and bracket clocks, as well as larger floor clock movements and mainspring barrels.

Each broach is 150mm in length with a regular taper and five precision-ground cutting edges for controlled, even material removal. Use them to ream out pivot holes, open up bushing seats, or size winding arbor holes to accept new brass bushings via friction fit.

Brand new and unused. An essential addition to any clockmaker's tool kit — especially if you already own a standard set and need to tackle the larger holes that smaller broaches simply can't reach.

• Extra large sizes (7mm–10.5mm)— covers the range that standard broach sets don't include, purpose-made for bigger clock movements
• Five-sided cutting profile— provides controlled, even material removal with each pass for accurate hole sizing
• 150mm overall length— longer than standard broaches, giving better reach and more gradual taper for precise work
• Regular taper with ground finish— allows incremental sizing by controlling insertion depth, so you can creep up to the exact fit needed
• Hardened steel construction— cuts cleanly through brass clock plates, bushings, and other non-ferrous metals