US Size for jobbers length fractional drills. Each storage hole is precisely sized for accurate, quick drill selection. For jobbers length fractional drills 1/16" to 1/4" x 64’s & 9/32" to 1/2" by 32nds. Fits in a 2" deep tool drawer. Corrosion-resistant, epoxy baked-on coating. Secure, snap-lock steel cover. Rugged, heavy gauge all–steel case.