Replacement for Chamberlain Group G8808CB-P 8808CB 8Ft,Compatible Whisper Drive Plus Models,Garage Door Opener 8Ft Rail Extension Kit,Replacement Belt,Effortless Installation, Low Noise While Working TOPPERFUN Also compatible with 721

Also compatible with 721

very strong and wear-resistant

Size: about 1-1/2" x 1-1/2''

It zeroes at any position and the last measuring position will be retained when shut off

total length: 2

Replacement for Chamberlain Group G8808CB-P 8808CB 8Ft,Compatible Whisper Drive Plus Models,Garage Door Opener 8Ft Rail Extension Kit,Replacement Belt,Effortless Installation, Low Noise While Working TOPPERFUN Also compatible with 721GARAGE DOOR OPENER 8FT EXPANSION KIT: The New 8ft Structural Steel Rail Expansion Kit Includes Rail Extensions, Replacement Belts, Garage Door Opener Brackets, And Other Related Accessories That Allow You To Expand Your 7ft Garage Door Opener Rail To Fit An 8ft Tall Garage Door GARAGE DOOR OPENER LOW NOISE : The 41A5250 Garage Door Opener Belt Operates With Minimal Noise Compared To Other Brands Of Drive Chains, Making It An Ideal Choice For