1/4 Drill Bit Extension Set 6" and 12" High-Carbon Steel Wood Spade Drill Bit Extender with 2 Pieces Key Spade Bit Extension Set for Wood Turners Furniture Carpentry and Construction(4PCS)

Good quality

straight, nicely built, good finish even good for holecuters up to about 2 inches. Its nice to have 2 lengths, so between them you get "short, medium and long" long gets a bit wobbly, so go slow. I only really need medium, but now I have all 3

Works very well. Pleased with this purchase. Screws, threads very clean. Functions well. I bought it to clean my Contigo thermal mug. I like my mug seasoned. Yet, after 4-5 months I clean it back to shiny with a scotch bright. This extension helps me get to the bottom of my 20 ouncer. Nice and shiny now. Ha ha, gotta season it again now!

The extensions themselves work great. The included hex key is poorly made and can jam in the set screws, so use your own or grind off any burrs.

Utterly useless and not fit for purpose. The grub screws vibrated loose and fell out quickly, despite being tightened as firmly as possible. I used the ones from the second extender with some threadlocker to keep them in place, but the moment the drill hit a bind the torque of the drill force the extender to spin around the shaft of the drill and wore the ends off them.

These are good when you're stuck in a pinch. The end is smaller than tool truck extensions I've seen. You will need bits with a 1/4 in drive to sit square in the collet. The grub screws can stick or strip if you crank on them. And they do usually stick out outside the head of the extender. It functioned well for my uses though. It may not last more than a few Jobs.

Higher quality than expected. Fast delivery.

I used this to reach a deep in a barely accessible spot to drill an access hole. It worked okay, but... The bit mounting hole isn't centered, so I had to keep the drill speed down even though I was drilling through wood. Wobble wobble wobble . I can't imagine trying to use this extension to drill steel.