Reliable Steel Material: Drill bit cutting wheel is made of steel, with outer diameter of about 0.87/0.98/1.26/1.38/1.73/1.97 inch/22/25/32/35/44/50 mm. After multiple treatments, the teeth are clear, burr-free, smooth and not easy to rust Attention: Resin cutting disc for drill is made of resin, its thickness is about 0.04 inch/1 mm, the inner diameter is about 0.08 inch/2 mm, the outer diameter is about 1.26 inch/32 mm, please keep the edge perpendicular to the cutting object, and the blade connecting rod should be inserted into the bottom of the electric grinder, not too hard Stable diamond material: Diamond cutting disc is made of diamond particles, with high cutting efficiency, good quality and long service time, which can meet your daily cutting or grooving of most metals, thin wood, plastics, etc. Wide range of applications: Rotary tool accessories are equipped with 4 screwdrivers of 2 types and 12 mandrels, easy to install and replace. Please pay attention to safety when using