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AT HSS Countersinks

AT hole enlarging core drills are designed to enlarge or open up existing holes in metalworking and industrial applications (application dependent). Unlike standard twist drills that start from solid material, core drills are commonly used when a hole is already present and you need to bring it to a larger diameter with improved control and efficiency—often in fabrication, maintenance, and repair work.

Alfa Tools C4F50542 1/2 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

Alfa Tools C4F50542 1/2 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

SKU: AT-C4F50542
MPN: C4F50542

Save $32.73
Alfa Tools C4F50542A 1/2 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

Alfa Tools C4F50542A 1/2 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

SKU: AT-C4F50542A
MPN: C4F50542A

Save $32.73
Alfa Tools C4F50542B 1/2 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

Alfa Tools C4F50542B 1/2 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

SKU: AT-C4F50542B
MPN: C4F50542B

Save $32.73
Alfa Tools C4F50543 5/8 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

Alfa Tools C4F50543 5/8 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

SKU: AT-C4F50543
MPN: C4F50543

Save $38.09
Alfa Tools C4F50543A 5/8 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

Alfa Tools C4F50543A 5/8 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

SKU: AT-C4F50543A
MPN: C4F50543A

Save $38.09
Alfa Tools C4F50543B 5/8 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

Alfa Tools C4F50543B 5/8 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

SKU: AT-C4F50543B
MPN: C4F50543B

Save $38.09
Alfa Tools C4F50544 3/4 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

Alfa Tools C4F50544 3/4 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

SKU: AT-C4F50544
MPN: C4F50544

Save $48.56
Alfa Tools C4F50544A 3/4 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

Alfa Tools C4F50544A 3/4 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

SKU: AT-C4F50544A
MPN: C4F50544A

Save $48.56
Alfa Tools C4F50544B 3/4 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

Alfa Tools C4F50544B 3/4 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

SKU: AT-C4F50544B
MPN: C4F50544B

Save $48.56
Alfa Tools C4F50545 7/8 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

Alfa Tools C4F50545 7/8 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

SKU: AT-C4F50545
MPN: C4F50545

Save $53.45
Alfa Tools C4F50545A 7/8 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

Alfa Tools C4F50545A 7/8 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

SKU: AT-C4F50545A
MPN: C4F50545A

Save $53.45
Alfa Tools C4F50545B 7/8 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

Alfa Tools C4F50545B 7/8 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

SKU: AT-C4F50545B
MPN: C4F50545B

Save $53.45
Alfa Tools C4F50546 1 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

Alfa Tools C4F50546 1 X 1/2 HSS 82° 4 FLUTE COUNTERSINK

SKU: AT-C4F50546
MPN: C4F50546

Save $58.96
Alfa Tools C4F50546A 1 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

Alfa Tools C4F50546A 1 X 1/2 HSS 60° 4 FLUTE COUNTERSINK

SKU: AT-C4F50546A
MPN: C4F50546A

Save $58.96
Alfa Tools C4F50546B 1 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

Alfa Tools C4F50546B 1 X 1/2 HSS 90° 4 FLUTE COUNTERSINK

SKU: AT-C4F50546B
MPN: C4F50546B

Save $58.96