Universal 1/4″ Hex Shank Design for a Wide Range of Applications. The vix bit are 5/64″, 7/64″, 7/64″, 9/64″, 9/64″, 11/64″, 5MM, 13/64″, 1/4″. Shank Type: Hex. The Colorful Aluminum Alloy Case is Pleasant and Easy to Recognize: Self centering hinge drill bit set self center with unique design and well-made, it’s a good choice for DIY enthusiast and professionals, whether it’s for self-use or as a gift.