Choosing diamond bits: shape, grit and size

Choosing a diamond bit means considering shape, grit and size together. Compare 21 STALEKS models across five shape groups, with a link to each product page.

What do red, blue, green and DUO mean?

For the STALEKS diamond bits compared here, red indicates fine, blue medium and green coarse grit. The manufacturer rates the red-blue DUO version as fine to medium. Marking describes grit; shape and dimensions must also fit the task.

Ball: compare size and grit

At 3.5 and 5 mm, compare red and blue at the same diameter. Across the red balls of 2.5, 3.5, 4 and 5 mm, the diameter changes while the fine grit remains the same.

Flame, pointed flame and DUO

Flame and pointed flame are different working shapes. Also compare working length: FA10B023/10 has 10 mm rather than 8 mm. DUO is a separate version with double diamond coating and red-blue marking.

Cylinder and rounded cylinder

FA30B023/6.5 and FA30B023/8 both have a 2.3 mm diameter and medium grit; their working lengths differ. FA30B025/10 increases both diameter and working length. The cylinder FA20B025/6 has a different geometry from the rounded versions.

Truncated cone: two diameters

Both blue cones have an 8 mm working length and medium grit. Head diameters are 1.8 and 2.5 mm respectively. A larger diameter is not a general indication of better quality.

Drop: a short working shape

The drop model has a 2.3 mm head diameter, 5 mm working length and fine grit. Compared with a pointed flame, both shape and working length change.

Ø means head diameter, not shank diameter. “—” means that no separate working length is specified here.

Before ordering

Choose by working area, shape, grit and dimensions. Check machine compatibility and follow the manufacturer’s instructions. This selection guide does not replace e-file manicure training. The bits are sold individually; a machine and handpiece are not included. Linked product pages show current prices and availability.

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