Robuta

https://www.rockler.com/onsrud-down-cut-spiral-bits
Onsrud Down-Cut Spiral Router Bit's down-shear spiral action prevents chip-out and fuzzing at the edge of the cut - ideal for cutting clean dados, grooves and...
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https://www.leevalley.com/en-gb/shop/tools/power-tool-accessories/router-bits/118414-misenheimer-carbide-upcut-spiral-bits
Misenheimer Carbide Upcut Spiral Bits
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https://www.leevalley.com/en-us/shop/tools/power-tool-accessories/router-bits/42891-high-speed-steel-onsrud-spiral-router-bits
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https://www.leevalley.com/en-gb/shop/tools/power-tool-accessories/router-bits/116284-leigh-high-speed-steel-spiral-upcut-bits-1-2-shank
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https://www.rockler.com/freud-down-spiral-router-bits
Freud Down-Spiral Router Bit's downward spiral leaves clean, splinter-free edges for dados, grooves and rabbets
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https://www.wish.com/product-reviews/3pcs-hss-spiral-grooved-step-cone-drills-bits-set-hole-cutter-tool-4-122032mm-59040bee9c2f4c25bce6a43c
Product Ratings: 3pcs HSS Spiral Grooved Step Cone Drills Bits Set Hole Cutter Tool 4-12/20/32mm. Wish
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https://www.leevalley.com/en-ca/tools/router-bits/misenheimer-router-bits/carbide-compression-spiral-bits
Carbide Compression Spiral Bits
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