4mm slot cutter
Vixen Dovetail Plate | eBay
Material: tungsten steel dovetail slot milling cutter. Hardness:HRC55 for cutting Ordinary Steel,Hard Steel,Heat Resistant Steel,Stainless Steel,Ti Alloy,etc.
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To accurately cut a, say, 12 mm wide slot with a 12 mm cutter is not possible; a 10 mm cutter should be used, followed by a 1 mm finishing cut ( ) around the periphery to finish the slot to exactly 12 mm.