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