
The first one I got must have been a broken piece of equipment, I drilled 3 holes in my stainless steel tool box with a very small bit to install some handles and it froze. After trying to unlock it for a while with no solution, I figured Amazon would send a replacement unit. This is one of the main reasons to buy from Amazon, the replacement arrived within 2 days, I couldn't believe how quick it was, I boxed up the old one and sent it back straight away and they let me know when it was received and credited . The new block worked fine and I checked its movements. With lots of holes and lots of screws to screw in, no problems so far and I don't expect any. drill hard.