AccusizeTools - 39 Pcs/Set HSS Interchangeable Pilot Counterbore Set, 500S-A000 Complete with pilots in fitted case. Each set includes:13 counterbores-26 pilots Counterbores: 1/4&#034; to 1&#034; by 16ths Solid wooden packing; Straight Shank 1/8&#034;, 5/32&#034;, 3/16&#034; and 1/4&#034; with 3/32&#034; shanks 3/16&#034;, 7/32&#034;, 1/4&#034;, 9/32&#034; and 5/16&#034; with 5/32&#034; shanks, 1/4&#034;, 5/16&#034;, 3/8&#034;, 7/16&#034; and 1/2&#034; with 3/16&#034; shanks, 5/16&#034;, 3/8&#034;, 7/16&#034;, 1/2&#034;, 9/16&#034; and 5/8&#034; with 1/4&#034; shanks 3/8&#034;, 7/16&#034;, 1/2&#034;, 9/16&#034;, 5/8&#034;, and 3/4&#034; with 5/16&#034; shanks Re-designed inside-out Enhanced wooden box Counterbore Size: 1/4&#039;&#039;; Pilot Hole Size: 3/32&#034;; Range of Pilot Sizes: 1/8&#034;-3/16&#034;; Shank for Counterbore:15/64&#034;; Overall Length: 3-13/16&#034; Counterbore Size: 5/16&#039;&#039;; Pilot Hole Size: 3/32&#034;; Range of Pilot Sizes: 1/8&#034;-1/4&#034;; Shank for Counterbore:19/64&#034;; Overall Length: 3-13/16&#034; Counterbore Size: 3/8&#039;&#039;; Pilot Hole Size: 5/32&#034;; Range of Pilot Sizes: 3/16&#039;&#039;-5/16&#034;; Shank for Counterbore:5/16&#034;; Overall Length: 4-1/16&#034; Counterbore Size: 7/16&#039;&#039;; Pilot Hole Size: 5/32&#034;; Range of Pilot Sizes: 3/16&#039;&#039;-3/8&#034;; Shank for Counterbore:3/8&#034;; Overall Length: 4-1/16&#034; Counterbore Size: 1/2&#039;&#039;; Pilot Hole Size: 3/16&#034;; Range of Pilot Sizes: 1/4-7/16&#034;; Shank for Counterbore:7/16&#034;; Overall Length: 4-5/16&#034; Counterbore Size: 9/16&#039;&#039;; Pilot Hole Size: 3/16&#034;; Range of Pilot Sizes: 1/4&#034;-1/2&#034;; Shank for Counterbore:7/16&#034;; Overall Length: 4-5/16&#034; Counterbore Size: 5/8&#039;&#039;; Pilot Hole Size: 3/16&#034;; Range of Pilot Sizes: 1/4&#034;-9/16&#034;; Shank for Counterbore:1/2&#034;; Overall Length: 5-1/8&#034; Counterbore Size: 11/16&#039;&#039;; Pilot Hole Size: 3/16&#034;; Range of Pilot Sizes: 1/4&#034;-5/8&#034;; Shank for Counterbore:1/2&#034;; Overall Length: 5-1/8&#034; Counterbore Size: 3/4&#039;&#039;; Pilot Hole Size: 1/4&#034;; Range of Pilot Sizes: 5/16&#039;&#039;-11/16&#039;&#039;; Shank for Counterbore:1/2&#034;; Overall Length: 5-3/8&#034; Counterbore Size: 13/16&#039;&#039;; Pilot Hole Size: 1/4&#034;; Range of Pilot Sizes: 5/16&#039;&#039;-3/4&#039;&#039;; Shank for Counterbore:5/8&#034;; Overall Length: 5-3/8&#034; Counterbore Size: 7/8&#039;&#039;; Pilot Hole Size: 1/4&#034;; Range of Pilot Sizes: 5/16&#039;&#039;-13/16&#039;&#039;; Shank for Counterbore:3/4&#034;; Overall Length: 5-3/8&#034; Counterbore Size: 15/16&#039;&#039;; Pilot Hole Size: 1/4&#034;; Range of Pilot Sizes: 5/16&#039;&#039;-7/8&#039;&#039;; Shank for Counterbore:3/4&#034;; Overall Length: 6-1/8&#034; Counterbore Size: 1&#039;&#039;; Pilot Hole Size: 5/16&#034;; Range of Pilot Sizes: 3/8&#039;-15/16&#039;&#039;; Shank for Counterbore:3/4&#034;; Overall Length: 6-3/8&#034;