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Alfa Tools Hole Enlarging Core Drills are made of high-speed steel that has a black and gold surface treatment to provide lubricity for close tolerance construction work. They are specially made for enlarging and finishing existing holes. These drills have 4 flutes and 3 flats on the shank. Ideal for use on truck frames, structural and heavy lattice work. Made in the USA.
| PART # | HOLE SIZE | DEC. EQUIV. | SHANK | MIN. STARTING HOLE SIZE | LENGTH (FLUTE / OAL) |
|---|---|---|---|---|---|
| HED121 | 3/8" | 0.3750" | 3/8" | 1/4" | 1-7/8" / 4-5/16" |
| HED129 | 1/2" | 0.5000" | 1/2" | 5/16" | 1-7/8" / 4-5/16" |
| HED133 | 9/16" | 0.5625" | 1/2" | 3/8" | 1-7/8" / 4-5/16" |
| HED137 | 5/8" | 0.6250" | 1/2" | 25/64" | 1-7/8" / 4-5/16" |
| HED141 | 11/16" | 0.6875" | 1/2" | 7/16" | 1-7/8" / 4-5/16" |
| HED145 | 3/4" | 0.7500" | 1/2" | 15/32" | 1-7/8" / 4-5/16" |
| HED149 | 13/16" | 0.8125" | 1/2" | 1/2" | 1-7/8" / 4-5/16" |
| HED153 | 7/8" | 0.8750" | 1/2" | 17/32" | 1-7/8" / 4-5/16" |
| HED157 | 15/16" | 0.9375" | 1/2" | 9/16" | 1-7/8" / 4-5/16" |
| HED161 | 1" | 1" | 1/2" | 5/8" | 1-7/8" / 4-5/16" |
