A 90° hart bur is purpose-built for prong and channel stone setting. This 17-piece kit gathers Swiss-made tungsten vanadium 90° hart burs across a comprehensive size range, 0.90mm–4.00mm, every one on a 3/32" diameter shank that fits standard flex-shaft handpieces and rotary tools. Each bur is machine made to ultra-high precision tolerances, so it cuts precious metal smoothly and cleanly with no chatter or drag.
Tungsten vanadium steel burs are the most widely used burs in the jewelry industry. High Speed Steel (HSS) burs are individually hand cut and vary from piece to piece, while tungsten vanadium burs are uniformly consistent in geometry and performance. HSS burs offer greater long-term durability, but tungsten vanadium burs provide exceptional precision at a lower cost, which makes them the preferred choice for everyday bench work.
These burs are produced on the most modern equipment available and hardened using Swiss steel know-how, which is why the line is a top seller at Otto Frei. The kit arrives in a round plastic holder for easy bench access.
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