"I've just used one of these to drill a 400mm deep hole through a solid brick wall with a 107mm core drill (I'm installing a duct for a tumble dryer) and found this drill a bit disappointing.
There is no reverse and the gap between the handle and trigger is quite small and I found it difficult to hold as I had rigger gloves on and could hardly get my finger in the gap.
The most annoying fault though is that the clutch constantly slipped at what seemed liked quite low torques. You can get quite a lot of friction from the side of a core drill once it's deep inside the hole if you move the drill slightly and the bit touches the sides but the clutch on this drill would disengage before you could right it. Really annoying and greatly extended the time it took to drill the hole. The drill is well made but perhaps a 107 mm hole is beyond its capacity. Could be ok for lighter use."
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Review 4 for Makita 8406/2 850W 240V Diamond Core Drill
"Only used it once so far to drill a 50mm core, clutch slipped nearly all the time thought I would spend a bit more to get a quality tool , VERY dissapointed will be taking it back for a refund I think"