The Witschi Ref. 02784 refers to a professional set of watchmaker's cutting broaches (also known as pivot broaches or reamers) designed for precision micro-machining, enlarging, and smoothing tiny holes or pivot bearings in watch movements and delicate instruments.
Product Specifications & Details
 Reference Number: Witschi Ref. 02784
 Tool Type: Five-sided cutting broaches (with handle)
 Dimensions: * Total length / Working lengths: Approximately 60 \times 40\text{ mm}
 Size Range: 0.05\text{ mm} to 0.55\text{ mm}
 Material & Design: High-grade hardened steel featuring multi-edged (typically 5-sided) tapered profiles, allowing watchmakers to delicately calibrate hole diameters, clean out debris, or true up jewels and bushings.
Key Applications in Horology
 Pivot Hole Adjustment: Enlarging or smoothing holes in brass plates or bridges to precisely fit new wheel pivots.
 Deburring: Removing burrs and minor imperfections from drilled micro-components.
 Friction Bushings: Preparing seats for press-fit bushings when repairing worn-out pivot holes.