full extention ball bearing drawer slides: 1,Cycling test:7,000times 2,Smooth and noiseless ... 3,Reasonable in price. full extention ball bearing drawer slides 1,more than 30 years experience for manufacturing lid stays ... .4,good quality with reasonable price,timely deliver.5,slides have past 7,000 cycles test.surface have past ... enquiry and trial order. full extention ball bearing drawer slides