They worked well when I used them on a hole in soft material (marble) about 1 inch thick per bit. After that the bit fell apart and failed, but if you just need to cut one hole they work fine.
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Vertical router BOSCH POF 1400 ACE 060326C820, 1400 W green
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52 Review
High-Performance Bosch BS80 6W Bandsaw - 80 Inch 4 Inch Blades
11 Review
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16 Review