Dormer A100 Series HSS Twist Drill Bit, 2.5mm Diameter, 57 mm Overall

Introducing the series of high-quality HSS Jobber Drill Bits from Dormer. These professional Drill Bits have been manufactured from high-quality steel and steam tempered to improve wear resistance and durability. Drill Bits feature 118° point angle for easy and precise application and a silver ring with size markings for easy identification. Dormer A100 general purpose drills are suitable for both hand and machine use and are ideal for drilling into steels, cast steel, grey cast iron, malleable cast iron, nickel-brass, aluminium alloy and graphite.

Dormer A100 Drill Bits are available in a selection of sizes:
• 1.0mm - 545-806
• 1.2mm - 178-046
• 1.3mm - 178-068
• 1.4mm - 178-080
• 1.5mm - 545-812
• 1.6mm - 545-828
• 1.7mm - 178-125
• 1.8mm - 545-834
• 1.9mm - 178-153
• 2.0mm - 545-840
• 2.1mm - 545-856
• 2.2mm - 806-454
• 2.3mm - 545-862
• 2.4mm - 513-001
• 2.5mm - 545-878
• 2.6mm - 545-884
• 2.7mm - 513-017
• 2.8mm - 513-023
• 2.9mm - 513-039

• Precision ground twist drill bit manufactured to DIN 338
• Heat and wear resistance properties
• Right-hand cutting helix
• 8% cobalt alloyed High-Speed Steel
• 118° point tip angle improves efficiency and eliminates walking
• Excellent for use on steels

• DIN338RN
• BS328
• ISO235

These bits are ideal for fast drilling of a plug, anchor or clearance holes in a number of materials such as steel, plastic, wood, metal etc. This makes it an essential piece of kit to have if you work within the carpentry/construction/engineering industries to save time and money on being able to perform more efficiently when working with stubborn materials.

Can these drill bits be used with any SDS drill?
No, they are standard drills, will not fit into SDS chuck

What does jobber mean?
The word jobber specifies the length of the drill bit. This generally means the length of the entire drill bit itself is significantly longer for diameter it has. As an example, a mechanic drill bit will have a much shorter flute and therefore have a much smaller overall length.

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.

BS328; ISO