1. Dentistry-Diamond Burs (1) Natural diamond powder has high hardness and can ensure the sharpness of the needle. (2) High technology is adopted to fix the diamond powder without the whole piece falling off, which can ensure the durability of the needle. (3) High-precision program-controlled lathe is used for processing, so that the handle body has highly prepared coaxiality and size. No swing is generated, thus being convenient for doctors to operate and not damaging the axis and bearing of the mobile phone. (4) The handle body is made of high-grade stainless steel with high strength and no rust. (5) Maximum allowable rotation speed. 450.000 rpm. 2.Model and specification: (1) Green: coarse sand blue: standard sand red : fine sand yellow : extra fine sand. 3.About package: (1)Package include:5pcs/pack (2)Handle diameter:1.6mm