Micro Drill Bits - HSS Mini Twist Drill Bit 10-Pack for Rotary Tools, Jewelry, PCB & Models, 0.3mm to 3.9mm

These micro drill bits are high-speed steel (HSS) mini twist drill bits, sold in packs of 10 bits of one size. Choose any size from 0.3mm to 3.9mm for small, precise holes.

Use them in a rotary tool, pin vise or small bench drill for PCB repair, jewelry, scale models, crafts, plastic, wood and thin aluminum or steel sheet. Fine bits break easily, so a 10-pack keeps spares on hand.

Specifications

• Type: micro twist drill bits
• Material: high-speed steel (HSS)
• Sizes: 0.3mm to 3.9mm in 0.1mm steps (37 sizes)
• Pack: 10 bits of the size you select
• Tools: rotary tools, pin vises, small bench drills
• Materials: PCB, plastic, wood, jewelry metals, thin aluminum and steel sheet

Choosing a size

Sizes are metric. Handy equivalents: 0.8mm is close to 1/32 in, 1.6mm to 1/16 in, 2.4mm to 3/32 in and 3.2mm to 1/8 in. Check that your chuck or collet closes down to the bit's shank size.

Best for

Model makers, jewelers and electronics hobbyists drilling tiny holes.

FAQ

Do these fit a rotary tool?
Yes, in a rotary tool chuck or a collet that matches the bit size. The smallest bits may need a pin vise or a keyless chuck that closes fully.

Is the pack one size or assorted?
One size. Each pack has 10 bits of the diameter you select.

Can I drill steel?
Thin steel sheet, yes, at low pressure. Use cutting oil and back the bit out often to clear chips.