Tested For Durability In Conditions Exceeding All KCMA Certification Requirements And BHMS Standards For Cycle Life, Strength And Finish Quality. Reliable, Self-Closing Power Of Dual Compression Springs. Use (2) #6 O.H. X 5/8" Type And (3) #6 F.H. X 1/2" Type Screws. 2.75"L X 1.875"W X .625"H.