Features:
1.Lightsworld Aluminum Profile Kit is a great solution for low-cost DIY under cabinet lighting fixture.
2.It is designed for recessed/surface mounting to tie-in furniture, under cabinet,shelves, drywall, wooden partitions, etc., also can be activated to create decorative luminescent bands in the walls, ceiling, floor, lights, work surfaces, shelves, steps, niches. 
3.The Oyster/Opal white PC cover works well to help spread the light. This aluminum channel/profile works with LED flex/rigid strip lights (not wider than 20mm wide). 
4.This kit includes the channel, cover, end caps, and mounting clips needed for a complete aluminum channel installation. 
5.The cover softens the 'spottiness' of LED strip lights, producing a more consistent and pleasing light. This aluminum channel is extendable and sold by meter. You can add as many meters as you need and connect them together seamlessly. 

Specifications:
Configuration: U-Shape Channel: Extruded aluminum Diffuser: Oyster White Cover 
Height: 0.94inch (24mm) 
Inner Width: 0.8inch (20mm) 
Top Width: 1.41inch (35.8mm) 
Back Width: 0.93inch (23.5mm)
 

Compatible with strips whose PCB width within 20mm:

HK-F3528X120-X DC 12V Dimmable SMD3528-1200 Double Row Flexible LED Strips 240 LEDs Per Meter 15mm Width 1200lm Per Meter

HK-F5050X60-X DC 12V Dimmable SMD5050-600 Double Row Flexible LED Strips 120 LEDs Per Meter 20mm Width 1800lm Per Meter

HK-F3528X120-X-HCRI High CRI > 90 DC 12V SMD3528-1200 Double Row Flexible LED Strips 240 LEDs Per Meter 15mm Width 1200lm Per Meter

HK-F3528IR120-X DC12V SMD3528-1200-IR InfraRed (850nm/940nm) Double Row Flexible LED Strips 240LEDs 19.2W Per Meter

HK-F5050IR60-X DC12V SMD5050-600-IR InfraRed (850nm/940nm) Tri-Chip Double Row Flexible LED Strips 120LEDs 28.8W Per Meter

HK-F3528X120-X-X-X 0.5M Double-Row Single-Chip (SMD3528) Flexible LED Strip Light

HK-F5050X60-X-X-X 0.5M Double-Row Tri-Chip (SMD5050) Flexible LED Strip Light