Had no problems, made nice round holes.

Drills perfect clean holes.

Hole is clean, no chipping or cracking on the plastic.

I only need these type of bots for thin metals that can’t withstand regular drill bits and still end up with a smooth hole

The drill bit did a good job cutting air holes into a plastic bin

First use drilling through regular thin gauge galvanized steel and it chewed up the entire bit and the hole was so rough I had to hand file for 10 minutes

They worked so quick and easy, made perfect holes.

possibly if they work well cut a hole in 1/8" or smaller material

So far so good 20, 3/8 holes drilled in 1/4 inch steel with a battery drill

and I am still 1/4 inch from getting to the correct hole size.

drilled out holes on the frame of my 66 mustang for brake booster mounting and work perfectly.

Used it to drill a hole for my garden hose through thick sheet metal and it made a perfect hole with minimum effort.

When used correctly, lasts a long time and makes perfect holes.

Mine cut very nice clean holes and cut fast when sharp

Created a perfect hole on my Honda miniVan to get battery cable into the driving cab.

Purchased to cut a 1 1/4" hole in a stainless steel sink, worked like charm.

I was surprisingly impressed with the quality of these bits, I rarely use multi-hole bits to give any sort of accurate rating but, i did have a project with some 1/4" steel piping and these bits ate through it where the previous 2 bits, well, bit the dust

It actually yielded a powder-like return from the sink material, and the hole was clean as an unused whistle

I use mostly on aluminum .Leave a nice clean hole and automatically ease the edge of the hole

I bought these to drill perfect holes in plastic planter

Wow, needed 1 1/8 hole to install a marine power center and it functioned perfectly and easily

with.and they make good holes

It drills holes perfectly and I love all size options this kit comes with.

Then on 4 it just got worse and the 5th hole I got nothing but smoke.

The edges of the bits appear to be smooth and no sharpness hence producing a smooth reamed hole

perfect hole set and the price was the best I have seen.

The first hole i drilled with these was perfect, the second hole the bit was already so dull it wouldn't step up to the next size

I made 24 smallish holes through sheet metal for bolts to go through for vents on trailer.

Drilled over 30 holes in a single sheet of plexiglass without fail, or cracking, with barely any support

They cut round holes perfectly--no more irregular holes

Cobalt works great had no problem in drilling any hole

These dont just drill holes, they literally BLOW holes into just about anything...from troop transports to bamboo huts..even through human torsos

Cobalt works great had no problem in drilling any hole

Great product for making precise hole sizes in sheet metal parts with little or no flash at edges and no distortion of thin surfaces.

The first hole i drilled with these was perfect, the second hole the bit was already so dull it wouldn't step up to the next size

Works well making larger holes on my .50 cal ammo cans.

Makes a perfect hole for installing a nice grommet to run cables through.