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) #5 O.H. x 5/8" and (3) #5 F.H. x 1/2" screws. 2-3/4"L x 2"W x 3/4"H.