I drilled a hole for 6 in the floor (screed) - I wanted to screw in a screw for concrete 7.5 with a TORX 5.5 star head with a small ratchet. After the second turn, the edges merged . I picked up the slotted one - I started to turn the corner, it broke off, I almost flew into the lobeschnik and the slot itself went like a screw . This was the first test. In short, I unscrewed it with ordinary pliers for the screw head . I'll post a photo later.