Fairly durable as long as you keep the cutter head in coolant and low RPM they seem to last a long time last. We drilled just over 50 holes (B8x31 I-beam and 7/16" flange thickness) with a 9/16" drill bit and the cutter head is still sharp. The quality of each cutter is very good and stable. The knockout pins are very strong and I've never had a bullet stuck (good bullet release). I like that the wire cutters come in a very nice protective case.
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.
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Tool set Ombra OMT94S12, 94 pcs, brown
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🧱 Bosch 2607017164 Piece Setter Masonry: Advanced Tools for Precision Masonry Work
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