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.