Irwin Unibit #11 HSS 7/8-Inch Step-Drill Bit, 3/8-Inch Shank (10311) USA Made Easy Hollower New Old Stock Moore &

New Old Stock  Moore & Wright 6" Toolmakers or Machinists Square

enabling the user to measure the center distance between holes or center punched locations that are at least

Size of square face: 40mm

and materials

making it highly durable and torsion resistant

Irwin Unibit #11 HSS 7/8-Inch Step-Drill Bit, 3/8-Inch Shank (10311) USA Made Easy Hollower New Old Stock Moore &Irwin Unibit #11 HSS 7 8 Inch Step Drill Bit, 3 8 Inch Shank (10311) USA Made The shanks on these step drill bits have three flats that help prevent the bits from slipping in the drill chuck during drilling. These cone shaped bits have steps of increasing diameter marked along their cutting head. As each bit is pushed into a piece of sheet metal or other thin material, each step on the bit widens the hole. The bits also have a self starting split