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 in type and (3) #6 F.H. x 1/2 in type screws. 2.75 in L x 2 in W x .75 in H.