1.item:twofold grounding packed full extension ball bearing rail
2.model:FTL-2704
3.application:keyboard,drawer,board...etc
4.material:cold rolled steel
5.width:17mm-35mm
6.length:12"-22"
7.thickness:0.7mm-1.5mm
8.cycling test:50,000 times
9.load capacity:22.7kg
10.features:smooth & noiseless,durable in use,32mm system hole,separable,tightening function 11.surface treatment:blue,black,colored zinc electroplated,nickelplated and chromeplated 
12.passed 48h neutral salt spray testing
13.installtion gap:12.7mm+0.3mm
14.standard reference:QB/I 2454-B50 (industrial standard of China),DIN 68858-82 (industry standard of Germany)
15.packing detail:

SIZE	CARTON SIZE(MM)	PAIRS/CTN	N.W(KG)	G.W(KG)
10"	270*200*100	15	11.5	12
12"	320*200*100	15	13.5	14
14"	370*200*100	15	16	16.5
16"	420*200*100	15	18	18.5
18"	470*200*100	15	20.5	21
20"	520*200*100	15	22.5	23
22"	570*200*100	15	25	25.5
24"	620*200*100	15	27	27.5

16.it can be mounted by matching with any shallow substances such as shallow drawers,flat roof or reel
17.mounting mode:install between bottom and side face