Jinquan's top hammer rock drilling tools and DTH drilling tools are the best in the drilling industry. Always solid advice, reliable service.
—— Dudu Myeni (South Africa)
Jinquan' service is unparalleled, they treat you like you are their only customer...I own my success to Jinquan, and Jinquan's drill bits, drill rods.
—— John Carew (Norway)
This is the best factory we met in the drilling industries, high quality, rational price.
—— Benny Barron (USA)
Jinquan will be your first choice when you buy China button bits, drill rods, DTH bits. I was really impressed by their strict quality control system.
—— Kwaw Koffie (Ghana)
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Coupling sleeves have different lengths according to various applications, and are mainly used to transmit impact energy into the drill string. These drilling tools are of great endurance and dependability.