Description
This bur trues and trims the inside of ring shanks, taking down solder seams and sizing stock in a single pass of the handpiece. Spearhead carbide inside ring burs carry a massive 1/4" shank diameter that prevents the bending common to skinny-shank cylinder burs. The trade-off is that they require a Jacobs chuck-style handpiece or a collet-style handpiece that accepts 1/4" shanks, and the payoff is a bur that stays true and performs reliably under demanding inside-ring work.
Available in two cuts to suit finishing and detail work at different stages, these burs measure 1/2" x 1" in head dimensions and are made from carbide for lasting durability and cutting performance.
Features
- 1/4" shank diameter resists bending during use
- Carbide construction for long-lasting cutting performance
- Large 1/2" x 1" bur head size suited for inside ring work
- Available in Fine and X-Fine cuts for versatile finishing applications
- Compatible with Jacobs chuck-style or collet-style handpieces that accept 1/4" shanks
Available Options
| Part # | Cut |
|---|---|
| 120.290 | Fine |
| 120.291 | X-Fine |
Compatibility
These burs require a handpiece with a Jacobs chuck or a collet capable of accepting a 1/4" shank. Standard flex-shaft handpieces with smaller collets will not accommodate this shank size.
Specifications
- Brand
- Spearhead
- Part #
- 120.290
- Type
- Burs
- Dimensions
- 3.25 in x 0.75 in x 0.75 in
- Material
- Carbide
- Head Shape
- Cylinder, inside ring profile
- Head Size
- 1/2" x 1"
- Shank Diameter
- 1/4"
- Handpiece Requirement
- Jacobs chuck or collet that accepts 1/4" shanks
- Application
- Trimming and finishing ring interiors
Cancer and Reproductive Harm. www.P65warnings.ca.gov.
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