Spearhead High Speed Steel Ball Bur Master Kit of 33 Pieces Prop 65 - Nickel-Cobalt-Cadmium Please note: acid-based metal testing

Please note: acid-based metal testing is subjective and requires careful observation and practice to master consistently

higher numbers indicate finer cuts

Built for demanding watchmaking work

Material Hardened steel Hole Profile Round Number of Holes 20 Hole Size Range 10 mm – 12 mm Origin Italy Brand OMO

Model PM-350 Motor Power 1/2 HP Speed Range 0–3600 RPM Speed Type Variable Shaft Diameter 1/2" Spindle Type Tapered (left and right) Overall Width (tip to tip) 16

Spearhead High Speed Steel Ball Bur Master Kit of 33 Pieces Prop 65 - Nickel-Cobalt-Cadmium Please note: acid-based metal testingImportant Notice: This set will ship incomplete. Due to ongoing supply constraints, Spearhead has been unable to fulfill all sizes in this kit as ordered. Otto Frei will contact you with the exact burs in stock, the sizes unavailable, and an updated reduced kit price at the time of your order. We are not back ordering missing sizes, as restocking timelines are unknown and inventory returns randomly. For reference, as of 7 29 2026, 23 of the 33 sizes