Insty Bit Quick Change Drilling Systems Drill Adapter With Out Bit 1/4"

CUSTOMER REVIEW



I had a construction project where I needed my contractor to drill through a steel box bracket enclosing a piece of 4 x 4 hard wood, through the 4x4, and then out the other side of the bracket. The site of the holes were very close to the concrete driveway. The drill had too wide a profile to be used directly and so a flexible drill bit shaft had to be used. Shafts with standard Jacobs chucks were also too wide in profile, so a flexible shaft with a magnetic hex socket would have to be used to be able to get low enough to the concrete. But there are no long drill bits on the market with hex bases. I found the insty bit line of products here on Amazon. I called the company directly for guidance. Their customer service rep was very helpful and very considerate. I ended up buying several different size bit adapters including this one and also some shaft adapters which are extra long and with 2 setscrews. They worked great. The contractor was able to make the holes for the mounting bolts. A few cautions. The contractor tried to hurry the last hole along. I don't blame him. It was getting late, dark, and cold. The flexible shaft horsed and then snapped. The bit with the shaft adapter was stuck partway in the bracket. I had not purchased a spare flexible shaft. My mistake. Always prepare for trouble. So he had to carefully wedge the drill between the concrete and the bit adapter, clamp the Jacobs chuck down on the hex portion of the bit adapter and back the bit out. The hex sections of the bit and shaft adapters are not as hardened as a drill bit, so the hex edges got a little rounded. Also we should have re-tightened the setscrews before trying to back the bit out. The high torque required caused the setscrews to cut a groove into the shaft of the bit. I still think they are excellent products when used in the manner for which they are designed. But know that if you clamp the hex portion in a Jacobs chuck it is going to round the hex sections a little and if you get a stuck bit, tighten the setscrews again before you try to back out.