Attention We provide 4 fixing screws on each of the 2 crossbars to solve the shaky, bending and uneven problems which were proposed on the reviews in the past! You can find the similar over sink dish rack in other stores using only 2 screws on one crossbar, so they still have these problems. Tips Before PurchasePlease carefully measure the length of your sink at first. Your Sink Length should be 35.5 inches and if beyond 35.5", please choose our another 3 tier over sink dish rack. If there are cabinets over your sink, the vertical space above the sink should be at least 30 inches to place dinner plates. So please confirm your sink length and vertical space first before your order!!! Dimensions24" - 35.5"(L) x 12"(W) x 19" - 22"(H). Extendable length 24 inches - 35.5 inchesExtendable height 19 inches - 22 inches. The length and Height can be adjusted by the short screws. (Please watch the attached video and you will easily understand the structure and installation steps)