We bought these to drill holes in PVC pipe to make a garden irrigation system. They worked fine. As with any hardened steel, being brittle, a piece this tiny in diameter breaks easily. That's why they come many in one package. A few tips to reduce breakage; Do not attempt to use drills when you are tired or when your physical fitness is below 100%. Working in a comfortable position on a firm, elevated work surface, insert the drill bit into the chuck and allow it to drill as deep as possible. as needed, nothing more. These are good pieces at a good price.
Tool set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
45 Review
Bit and socket set BOSCH Promoline (2.607.017.322), 26 pcs.
24 Review
MICHELIN Latitude Sport 3 235/60 R18 103W summer
22 Review
Cordless drill driver BOSCH GSR 120-LI (06019G8020/06019G8000)
54 Review