When it comes to size selection and versatility, this set is not bad however, hen it cones to functionality and performance, it lacks big time.Pros:1- Great socket size selection.2- Both SDS Plus and SDS Max shaft.3- Enough pilot bits and screws to last you along time.4- Comes with a case to hold everything.Cons:1- The screw that it's use to hold the pilot bit in its place, becomes loose making it useless.2- The sockets get stuck on the threaded shaft making it very hard to unscrew them apart.3- The teeth of the bits are not very good at shipping thru concrete. I haven't try any other material.

PRODUCT:"dashap 14PCS Concrete Hole Saw Kit, Masonry Hole Saw, SDS Plus & Max Bit Shank for Cement Brick Wall, Carbide Hole Saw Kit 30 40 50 65 80 100 125mm, Diamond Drill Core Bit for Brick, Cement, Stone (Kit 30 40 50 65 80 100 125mm), by dashap"---------These do work well on paving stones, cinder blocks, etc..4 star only due to damaged threads during Manufacture on one of the drive shafts.I expect that You are unlikely to see that issue.Sizes: and what is included:Saw Size my measured Outside Diam. at teeth30mm (1-3/16") ~29.8mm (1.17”)40mm (1-19/32") ~41.87mm (1.65”)50mm (1-31/32") ~49.76mm (1.96”)65mm (2-9/16") ~67mm (2.6”)80mm (3-5/32") ~81.61mm (3.21”)100mm(3-15/16") ~101mm (3.98”)125mm(4-29/32") 126.48mm (4.98”)1 hex key ?? (no, it includes one 10mm open end Wrench to fit the bolt head that holds the masonry pilot drill bit in place.)It includes TWO sizes of Hammer-Drill shanks. (SDS-Plus size, and the larger diameter SDS-MAX size shaft.)1 SDS-PLUS shank adaptor 10mm or 0.393” or 25/64”1 SDS-MAX shank adaptor, 17.94mm or 0.706” diam(the HOLE-Saws screw onto the end of the adaptor shanks and the pilot bit inserts into the shank held in place by a bolt.It includes extra masonry drill bits, and even extra bolts to hold them:5 masonry drill bits (11cm long; 7.1mm shaft diam.; ~8.2mm Tip Diam.) (They have 1 flat-shaft section for the bolt tighten contact)5 hexagonal (10mm hex head) bolts to hold a drill bit. (M6-1.0 thread ~13mm long), (16.3mm long = threads +head).The Bolt threads have a spot of blue Loctite to help keep them from loosening during use. (but that also means they won’t screw in as easily the first time using only your fingers- but they include a wrench!)I put silicone grease on the threads of the “hole-saw and shaft” to help keep them from possibly binding.Just in case, I also tape over the screw joint inside the saw to help keep dust away from the threads there.There are two 1cm holes on both sides of the hole saws near the shaft end.I suspect it can release dust buildup there while cutting.But Also: A 1cm bar could be slipped through those holes could provide leverage to help unscrew it from the shaft (in a vice?). (not included)Also if needed, something can be pushed in to those holes from either side to help eject a stuck cement chunk?The case is heavy durable. It has real plastic hinges, and actual buckle type front closure latches.The metal parts combined are pretty heavy (as they should be) and this case works well and stores all parts as compact as possible. (see picture showing a couple ways to get all the parts to fit into it.)================================Don’t like:There are NO instructions, Tips, or Precautions included with these cement core hole bits.Sometimes water can be used while cutting to improve the cutting, keep saw cool, and help to keep dust down.These hole cutters can be used wet or dry.View some YouTube videos if you aren’t familiar with how to use these.---------------------SAFETY first: (was not mentioned)Breathing in fine rock dust can risk lung damage. It’s a good precaution to use a good tight fitting N95 type mask over nose and mouth to keep any fine limestone dust out of your lungs. Better to be safe than sorry.Be sure a mask is adjusted to prevent cracks letting in air/dust around the nose, chin, etc.There are also professional grade mask systems available used by workers in limestone, welding, metal working, etc..(A cloth handkerchief is not adequate!)Eye protection may also be advisable.Especially If working in an enclosed area, a dust capable vacuum cleaner can help as well.Of course it’s your decision.---------------------The threads at the end of one of my hole-saw shafts were bent together making it impossible to screw on a hole saw.It appears that shaft was accidentally dropped onto that end before it had been painted. That damaged the end of the threads.I used a small metal-cutting triangular needle-file to open-up the thread section that was bent so a hole saw now screws on easily again.It’s not likely you’d see the same thing.

What a great hole saw kit. Stays sharp and I've drilled many holes through concrete walls

I had to drill two holes in a foundation wall. The first hole was 4" and I had to drill through 8" of solid concrete. The 120mm did its job. The second hole was only 2" through 8" solid concrete. Only took 20 minutes for this one. I was using a Milwaukee demolition hammer drill. Went through six batteries from start to finish.

Bought this last year and just got a chance to use it. I had a hole I was drilling for a conduit, I was going slowly and the saw slightly hit a rebar and the whole thing broke into two.Material is not strong enough, waste of money