Lishui Wangong Precision Machinery Co., Ltd
Brandname seems to be ERSK
http://wgjxzgzz.en.made-in-china.com...catalog-1.html
They supply their own brand profile rails, 25 usd per metre for 20mm profile rail and they also offer ballscrews, custom double nuts and machining.
I've never used the made-in-china.com website but I assume it is an aliexpress/alibaba clone.
