Features:Perfect for use on acrylics or hard gels.Teeth on top could be used for clean dead skin or cuticula.3/32" shank size & suitable for most standard size nail drill.Aviable for left & right hand, and head top with end cut.From the upper part of the base of the drill, the roughness changes from fine, to middle, to thick.Specifications:Grit Head Diameter: Φ6.6mm (0.26inch)Grit Head Length: 13mm (0.51inch)Shank Diameter: 2.35mm (3/32inch)Matetial: Tungsten SteelPackage include:1 x Nail Drill Bit