Hymnorq Step Drill Bit Set of 3pcs, 4 to 12mm / 20mm / 32mm, HSS with Black Nitride Coated, Self-Centering Split Point, Anti-Skid 3-Flat Shank, Double Spiral Flutes, for Sheet Iron Aluminum PVC Wood

The holes are intended for rivets, so I bought them to put round holes in sheet metal. There was a mistake with the drills. The diameter is significantly smaller than it It is 8 mm for the 9 mm hole, for example. A 70 mm ball is 7 mm wide, 8 mm is 70 mm long. In this case, a rivet of 9 mm or 8 mm won't fit I agree with you that using the next size is Standard bits need to be used to ream out the hole so the rivet can be positioned. Please take note There is usually a gap between rivets of There should be a clearance of 1mm. The problem is that my return window expired before I realized what the issue was, so I would have sent back these items.

Queen Berg

| May 09, 2021

You can grab / pull through once you break through the back of the lobular). There are times when the common fractional steps are a bit too large and drills are a little bigger than they should be. The metric sizes sometimes fail to land in a good missing size (e. g. There are holes in the center for inserting nuts). A lot of sizes are available in this set. Maybe it's just me, but I wish the big one had a larger round shank (I don't trust driving off the small hex, either for strength or precision) but that set might be more expensive.

Penny Hickman

| Mar 29, 2021

The shaft of the big one snapped once when I used it. There is a small one that we have not used yet because the larger one wore out quickly. A little extra money will buy a better pair of shoes.

Roy Carlson

| Feb 16, 2021

I love how these little guys look. Having used one of them, the first cut was like a breeze and as most unibits work, they require some force to get started, but once this one got going it was like a dream come true. A little case is included with them as well. As for durability, I just got them, so I did not put any stars in it.

Serena Petty

| Apr 25, 2021

This kit is a good price, but it's not the best quality. A unibit snapped in half on the very first day of using it. In addition, the tips of the blades don't Buying another brand would be a good choice.

Della Frey

| Nov 02, 2020

The picture on the product is not true to the actual item. In the past, I had ordered spiral screws, but the last time I got stepped screws that didn't fit my 1/4-inch impact driver.

Emerson Dixon

| May 16, 2021

I used it to drill a hole in my car bumper during body kit installation. As a result of it, I was able to drill a clean hole that was easy to insert and remove, better than regular drill bits that would grab everything just to chew on it.

Raiden Benton

| Mar 13, 2021

I will keep this short.

Jad Davenport

| Oct 03, 2020