28 hole Allen bit organizer, prosthesis bit holder fits 1/4 inch Allen bit and drive adapter [size] according to the designer's dentures, standard way 6.35mm (or 0.24 inch) drill bits. The [durable] prosthetic bit holder is made of heavy-duty plastic because it is a durable material that is naturally resistant to heat and chemicals. [180 degree rotation] the hinge jaws can be fully opened, providing easy access to all drill bits and grisly view of all the realistic details printed on the plastic prostheses. Color: Red/WhiteMaterial: PlasticPackage Contents: 1 x Denture Bit HolderOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement error is +/- 1-3cm.