ASNOMY 5Pcs Countersink Drill Bit Set for Metal, M2 HSS 82 Degree Counter Sink, 5 Flute 1/4 Inch Hex Shank 1/4” 3/8” 1/2” 5/8” 3/4” Countersink Drill Bit for Most Metals, Wood,Fiberglass Plastic - Amazon.com
Völkel 67100 Twist Drill Bits Set of HSS-G, 0 V, Silver, 1.0-10 mm - Amazon .com