What type of drill bit to lengthen this slot

slot formed in one portion thereof , and a pin carried by the last support DRILL ROBERT E CAR- MICHAEL , Damon , Tex Filed Nov 18 , 1918

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slot empire777 A slot drill is just a 2-flute end mill used for cutting a slot, as per the name, more clearance for the chips to come out of the back

slot machines png M333 - Metric HSS Slot Drill & End Mill Set - 12 Piece Ø4 -Ø12mm HAFCO Code: M333 ex inc ADD TO CART Compare Wishlist M335