COVID-19 Update (Latest 05/11/20): We are currently open, delivering to our customers nationwide and more importantly following the government guidance carefully.  
Please bear with us on delivery times, we are currently experiencing a delay of +1/2 days to process and deliver orders. Most staff are working remotely so order processing is slower.  
We cannot take orders over the phone.

0845 077 3839
01142 310 911

Open: Mon - Fri: 9am - 5pm

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Chimney pots, manhole covers, plasterers scrim and more

Current special offers on a number of building supplies

Free delivery for orders over £60 on selected products. (excludes bulky, heavy and fragile items)

  • Next day delivery
  • Saturday delivery
  • AM delivery

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Dormer, A777 HSCo Cobalt Heavy-Duty Jobber Drill Bits Imperial

Availability: Out of stock

£12.95  per item
inc VAT

Product Specific Details

Tip diameter: 1/4in.
Working length: 63mm.
Overall length: 101mm.

Product Code: DOR14COB
£5.65  per item
inc VAT

Product Specific Details

Tip diameter: 1/8in.
Working length: 36mm.
Overall length: 65mm.

Product Code: DOR18COB
£8.10  per item
inc VAT

Product Specific Details

Tip diameter: 3/16in.
Working length: 52mm.
Overall length: 86mm.

Product Code: DOR316COB
£26.19  per item
inc VAT

Product Specific Details

Product Code: DOR38COB
£18.03  per item
inc VAT

Product Specific Details

Tip diameter: 5/16in.
Working length: 75mm.
Overall length: 117mm.

Product Code: DOR516COB
£7.33  per item
inc VAT

Product Specific Details

Tip diameter: 5/32in.
Working length: 43mm.
Overall length: 75mm.

Product Code: DOR532COB
£9.98  per item
inc VAT

Product Specific Details

Tip diameter: 7/32in.
Working length: 57mm.
Overall length: 93mm.

Product Code: DOR732COB
(Prices include VAT)


A777 Imperial Cobalt Jobber Drill Bits have a heavy-duty, 135° split point for use when greater heat is generated during drilling, e.g on higher tensile tougher materials and in particular the Aerospace Industry.


Flute Geometry: Standard Helix, Right hand spiral, Thick Web
Point Angle:
0.30 mm - 0.95 mm 118° Conical point
1.00 mm to 1.40 mm inclusive 135° 4 facet point
1.50 mm and above 135° split point sizes (Split point geometry to NAS 907 Areospace Specification type P3 Point)

Surface Treatment: Bronze
Material: HSCo Cobalt steel

DIN 338 RN / BS328 / ISO 235

Additional Information

Product Code GRPDOR18COB
Quick Find Code N/A
Manufacturer Dormer
Country of Manufacture N/A

The free delivery over £60 does not include certain items, typically this relates to chinmey pots, large items and heavy manhole covers. Whilst we would like to include delivery due to the weight or fragileness we have to send the products via specialist companies to ensure safe and sucessfull delivery to you.

All delivery methods will require someone to accept the delivery, check it over and sign received in good condition. Please note any damages on the delivery sheet / electronic device, do not use the product and contact us straight away.

Next day, AM/PM or even Saturday deliveries can be arranged at an extra cost. Please add your items to the shopping cart for an instant quote.

Pallet Deliveries (Large Items)

After your order has been dispatched you will be contacted on the phone (within 2 days), by your local pallet delivery company in your area, once they receive the goods from our local depot, to book-in a day that is convenient for you. (this will not occur on Timed, Next Day & Saturday deliveries). The delivery will arive on a lorry with an electric tailift and a hand pump truck.

Parcel Deliveries (Smaller Items)

After your order has been dispatched you will receive your goods within 2-3 days. No telephone book-in will occur.

Remember when handling your goods:

  • Take care when removing the packaging / banding and also when removing the product out of the crate / pallet as they may have weakened during transit and could be unstable.
  • Some products are quite heavy and can weigh a lot. Consider this when arranging the delivery, as you may need appropriate lifting equipment, or an extra pair of hands.

To ensure you prepare adequately for pallet deliveries please watch the video below for a comprehensive guide.


Delivery Details Icons