Drilled 72 holes in a 1/4 inch angle iron and cut the 72nd hole almost as easily as the 1st hole. I confess that I used a lot of coolant in the process. and did all drills at 1-2 second intervals to reduce heat build-up, however I had less success with the more expensive drills.
Tool set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
45 Review
𧱠Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
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Tool set Ombra OMT94S12, 94 pcs, brown
27 Review
Bit and socket set BOSCH Promoline (2.607.017.322), 26 pcs.
24 Review