"Purchased this bit as my the standard 450mm bit was short for drilling through a wall. In a nutshell - the bit failed in its 1st go! The bit broke in 2 pieces. Wasn't expecting it to fail on its first use. Best to avoid this and spend a little more a bit of this length as its nightmare pulling a bit out of a wall.
On the upside, lad at the local screwfix gave a refund on it and was very helpful."