A must have in any mechanic's tool box. Incredibly comfortable. If I can get my wife's permission I would happily give my buddies a pair, both sizes. You can even catch a fool with this device. Let's say you spend 30 minutes lining up and blowing through the middle dot on the whistle. You then place this in place and center the drill in the dent. You may notice that the point is not at a right angle of 90 degrees up or 90 degrees straight to the side. You can insert a transfer punch into one of these pilot holes, which fits exactly like the drill. You can then attach a spirit level (or your smartphone's goniometer) to the transfer punch to ensure you drill and/or cut the hole exactly where you want it. I don't see any way to get less than 5 stars.