Busch Fig 4203S 2 Groove Carbide Twist Drills on 3/32″ Shanks .70mm-1.60mm – Kit of 10

2-Groove design recommended for hard materials like steel, platinum, titanium, and hard metal alloys of gold and silver — outstanding service life.

Busch Fig 4203S carbide twist drills are engineered to expel more material from the hole, allowing them to perform better and last longer when cutting hard metals. These drills outperform high-speed steel and standard tungsten carbide when drilling jewelry metals and can also be used on mild steel. The special 2-groove construction makes chip removal easier and significantly reduces breakage risk.

Using a coolant extends service life. These drills perform best when used in a drill press — as with any drill, breakage can occur with excess leverage or canting. When used freehand, a starting guide hole is recommended.

Not for use with glass, ceramics, or gemstones.

Features

• 2-groove carbide construction for superior chip expulsion and reduced breakage
• Outlasts high-speed steel and standard tungsten carbide in hard metal applications
• Suitable for steel, platinum, titanium, and hard alloys of gold and silver
• Compatible with mild steel
• Use of coolant increases drill lifespan
• 3/32″ shank fits standard flex shaft and drill press collets
• Freehand recommended speed: 5,000–9,000 RPM
• Drill press recommended speed: 8,000–14,000 RPM
• Not for use on glass, ceramics, or gemstones

Specifications

What’s Included

Kit of 10 carbide twist drills, one of each diameter:

• BAU128.427 — 0.70mm
• BAU128.428 — 0.80mm
• BAU128.429 — 0.90mm
• BAU128.430 — 1.00mm
• BAU128.431 — 1.10mm
• BAU128.432 — 1.20mm
• BAU128.433 — 1.30mm
• BAU128.434 — 1.40mm
• BAU128.435 — 1.50mm
• BAU128.436 — 1.60mm

Notes

• A starting guide hole is recommended when drilling freehand.
• Coolant use is recommended to maximize drill lifespan.
• Breakage may occur with excess leverage or canting — drill press use minimizes this risk.
• Not suitable for glass, ceramics, or gemstones.