Zhengzhou Hongtuo Superabrasive Tools Co.,Ltd is the largest Superabrasive Honing Stones manufacturer in China. B12-NM05 Application:cylinder cylinder and sleeves, connecting rod,roker arm,fork and fuel injection nozzle & pump bore honing Material to hone: Diamond honing stone: cast iron, rabbit, brass, bronze and alloy, glass and ceramics CBN honing stone: tool steel, die steel, harden steel, HT alloy steel and high-chromium cast iron Custom-made is possible.