The Best Drilling Coolant I've Ever Used for Drilling Steel

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4110 Series - 10xD. Guhring Indexable Tip Drill. Dia Range: 14mm - 14.49mm. Coolant Through. Shank: 5/8.

Guhring Drill Body 14mm - 14.49mm Indexable Tip 4110 10xD Coolant Through HT 800

Are these wood-boring, or metal-boring drill bits? Does it matter? Picked these up at an estate sale years ago and there isn't much info beyond Made in Austria. : r/Tools

Tap Magic 4-ounce Bottle

Machine Tool Coolant: Topping Up a High Concentration

Selecting the Right Cutting Oil for Drilling Metal - Fusion

Best Lube for Drilling Stainless Steel

Machinist Makes Lard Cutting Oil For The Shop

Machinist Makes Lard Cutting Oil For The Shop

Make A Simple Portable Machine Fine Drip Feed Cutting Oil System

Reviews for Drill America 27/64 in. Quick Change Drill Bit with Hex Shank (6-Pieces)

The Best Drilling Coolant I've Ever Used for Drilling Steel