Photo 1 of 6 Pcs M35 Cobalt Countersink Drill Bit Set for Metal with Case 82 Degree 1/4'' Hex Shank HSS 5 Flute Center Punch Tool Sets for Wood, Quick Change Bit 1/4” 5/16" 3/8” 1/2” 5/8” 3/4”

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Photo 1 of 6 Pcs M35 Cobalt Countersink Drill Bit Set for Metal with Case 82 Degree 1/4'' Hex Shank HSS 5 Flute Center Punch Tool Sets for Wood, Quick Change Bit 1/4” 5/16" 3/8” 1/2” 5/8” 3/4”Photo 2 of 6 Pcs M35 Cobalt Countersink Drill Bit Set for Metal with Case 82 Degree 1/4'' Hex Shank HSS 5 Flute Center Punch Tool Sets for Wood, Quick Change Bit 1/4” 5/16" 3/8” 1/2” 5/8” 3/4”