Features: Model: RA 1~8 (Total 8 sizes optional) Dental lab Clinic low speed RA (Right Angle) Tungsten Steel burs 5 pieces per box Tungsten Steel material For dental lab or clinic use Specification: Model Head diameter Bur full length Shank diameter RA 1 0.8mm 22.5mm 2.35mm RA 2 1.0mm 22.5mm 2.35mm RA 3 1.2mm 22.5mm 2.35mm RA 4 1.4mm 22.5mm 2.35mm RA 5 1.6mm 22.5mm 2.35mm RA 6 1.8mm 22.5mm 2.35mm RA 7 2.1mm 22.5mm 2.35mm RA 8 2.3mm 22.5mm 2.35mm