Erbauer HSS Cobalt Drill Bit Set 15Pcs
I've been a regular user of the Erbauer Titanium drill bits for some years and have been happy with their performance.
This is my first set of 'Cobalt' bits by Erbauer. They were purchased to drill stainless steel and have proved capable for the task. It is important to try and use the recommended speeds (chart included in kit)
27 Aug 2014
Used these bits to drill out a sheared off bolt in a London Taxi Chassis.A standard HSS drill bit would not touch it.Used these drills in progressive sizes until the bolt was drilled out and then re tapped the thread.Iff these drills are used with a electric drill at the slowest possible speed using plenty of cutting fluid to keep the bit cool they will do the job.
13 Jul 2014
Don't waste your time or money
These drills are terrible. They are blunt and brittle. I am an events chippy, I use my tools in a wide variety of scenarios. These drills have given pathetic performance on wood and metal. They come completely blunt so you end up pushing harder and then they snap. You end up with a sore arm and half a box of useless drills.
11 Jul 2014
Cheap but nasty
We purchased a set of these cobalt drills to extract a broken bolt, we used a small drill to make a pilot hole it shattered, we use a second small drill to finished the pilot. We then used a larger drill to finish the job that shattered.
So we returned to good old HSS to finish the job.
Do not purchase these drill if you intend drill hardened steel.
24 May 2014