15 years experiences High professional Rotary hammer manufactory; ISO certification, GS, CE, EMC, UL certification High professional Rotary hammer manufacturer. Rotary hammer 20mm, Rotary hammer 26mmZHEJIANG ZHONGYOU INDUSTRY & TRADE CO., LTD ... USD 13,000,000 annual sales. Under the guideline of “Quality is the life of enterprise”, we make effort to eliminate ...