CZ303, for 8 piece set. 9/16" to 1" x 16ths S&D drill index. For drills: 9/16" to 1" by 16ths. Holds drills securely by the 1/2" shank. All-steel reamer cases. Each storage hole is precisely sized for accurate, quick tool selection. Corrosion-resistant, epoxy baked-on coating. Secure, snap-lock steel cover. Rugged, heavy-gauge all-steel case. Cutting tools are shown for display purposes only. Huot does not manufacture or distribute cutting tools