Uxcell Spiral Bevel Gear Product name : spiral bevel GEAR; fit for : Hitachi 180 angle grinder Material : metal; ring GEAR size : 78 x 15 x 18Mm/3.1" x 0.6" x 0.7" (outer Dia.*Inner Dia.*T) Pinion GEAR size : 26.5 x 10 x 20.5Mm/1.1" x 0.39 inch x 0.81"(Outer Dia.*Inner Dia.*H) Weight : 305G Package Content : 1 x spiral bevel GEAR set