... 2008 certificate Powder metallurgy sintered all types of bearings for garden tools Features: 1High density and good ... Gears, Spur gear, Curved gear, Rack gear, Circular gear, Driving & driven gear, Medium gears, Planetary reducer gear, Planetary reducer gear parts, ... projector, Rockwell hardness tester, Metallographic measuring instrument, gear beating detector, beat monitor, digital push & pull ...