"Bought these as I bust my arbour pilot drill bit (Bosch). I chanced these because they looked like they would fit. They did & I have used them at work. They are longer than the original Bosch pilot bit but that doesn't effect performance just need a careful hand. Would recommend, time will tell how long they last but at the price it shouldn't matter."
"I have had 2 off sets of these the first one was returned as the 5mm drill was useless did not run true, returned and wife pick up another set now the 4mm drill is useless and does not run true. Will not try for a 3 go."