Two Wing Type	Thread Shank Size	Drill Bit Diameter	Tungsten Carbide Grade	Flushing Hole Diameter
Centre Flush	M16	27mm	Standard	8mm
	M16	28mm	Heat Resistant	8mm
Extra Flush	1/2" Whitworth	27mm	Standard	5mm
	1/2" Whitworth	28mm	Heat Resistant	5m

General Features

Fast penetrating two wing drill bit for wet drilling suitable for most types of rock.
The negative front rake and eccentric tips make it suitable for hard rock.
The standard grade of tungsten carbide insert provides extremely good wear resistance and is time proven for all types of conditions. Unless otherwise specified, the standard grade of carbide is assumed.
For abrasive conditions, such as found with some sand stones, the tungsten carbide inserts can be supplied in a heat resistant grade. However, these inserts may chip under high impact loading.
Centre Flush drill bits have an 8mm diameter centre hole and Extra Flush Bits have a central water hole plus two side water grooves for extra flushing.
The drill bit body is specifically designed for clearance of rock cuttings. The body is made of high tensile material for strength and abrasion resistance.
Reference should be made to DSI’s "Practical Guide to Rock Bolting" highlighting installation problems associated with collaring the hole, angle bolting, hole diameter and depth.

Packaging

Supplied in plastic pails containing 50 drill bits.

Notes

Only DSI rock bolt components should be used in order to obtain full performance of the bolt system.
DSI's Mining Products Division is Quality Assured to ISO 9001:2000, Registration No.QAC/R61/0315.

PRINTED December 2006: All dimensions, weights, quantities and specifications are those applicable at the time of publication and may be amended from time to time.