ABN 1/8" to 1/2" Titanium Step Drill Bit plastic wood steel brass aluminum copper 1/8&#034; 5/32&#034; 3/16&#034; 7/32&#034; 1/4&#034; 9/32&#034; 5/16&#034; 11/32&#034; 3/8&#034; 13/32&#034; 7/16&#034; 15/32&#034; 1/2&#034;