Dormer HSS 0.3 → 1; 0.38 → 0.82 mm 20 piece Miniature Drill Bit Set

  • RS Stock No. 663-651
  • Mfr. Part No. A191 31M
  • Manufacturer Dormer
Technical data sheets
Legislation and Compliance
RoHS Status: Not Applicable
COO (Country of Origin): GB
Product Details

Dormer Miniature 20 Piece Drill Set

A191 31M is a miniature drill bit set of 20 HSS drill bits from Dormer. Sizes supplied range from 0.3mm to 1mm in 0.05mm steps plus the following sizes 0.38, 0.52, 0.58, 0.78 and 0.82mm.

This miniature drill bit set is suitable for both professional and DIY enthusiasts to achieve precise and accurate results when in use.


Supplied in a plastic case which dispenses drills individually
HSS (high-speed steel) drill set No. 31M – HSS bits are hard and more resistance to heat than high-carbon steel
Bits increment in sizes of 0.05mm

Typical Applications:

A good selection of all types of drill bits guarantees the job done quickly and easily. Using the right bits type to drill into a variety of materials ensures safety and reduces the drilling time.

Whether drilling wood, masonry, acrylic, metal or any number of other materials, having the drill bit for the job will give you the ability to drill with confidence and accuracy. Some drill bit sets will offer a mix of bit type to cover all types of jobs from wood and metal through to masonry, with some also including more specific bit types such as flat wood drill bit or countersinks.

Miniature Drill Bit Sets are used by both professionals and DIY enthusiasts for jobs such as:
Model making
Jewellery making
Clock making

What is HSS?

An acronym for High-speed steel, HSS is generally the go-to type of steel needed for drill bits due to their excellent heat resistance at high speeds. As a standard drill can spin upwards of around 500 - 700rpm, the friction can cause a substantial build-up of heat. Something which would not be wanted when working with wood and plastic.

Attribute Value
Number of Pieces 20
Maximum Size 1mm
Minimum Size 0.3mm
Material HSS
Set Contents 0.3 、 0.35 、 0.38 、 0.4 、 0.45 、 0.5 、 0.52 、 0.55 、 0.58 、 0.6 、 0.65 、 0.7 、 0.75 、 0.78 、 0.8 、 0.82 、 0.85 、 0.9 、 0.95 、 1 mm
2 : Next working day
21 Within 5 working day(s) (Global stock)
Price (ex. GST) Each
$ 116.88
(exc. GST)
$ 134.41
(inc. GST)
Per unit
1 - 5
6 +
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