The Door Bar Pro Model 32 is very easy to install and use. It's made to fit doors that are 32 inches wide. The Model 32 is 37 inches long and 1-1/4 x 1-1/4 inches square. To determine which length/model door bar you need, measure just the width of the door itself. - A 32 inch wide door needs the "Model 32" - A 36 inch wide door needs the "Model 36" - A 42 inch wide door needs the "Model 42" It mounts on 2 exceptionally strong 1/2 inch diameter bright steel colored L-screws that are 4-3/4 inches long. All parts can be painted or repainted to match door and trim paint colors. It's the strongest type of door security bar available because it's made from high-grade steel, not aluminum like many competitors use. In that our single door bars only weigh a few pounds each, the weight is never an issue. What matters most is the overall strength of the door security bar and the mounting hardware. And ours is the best available anywhere. It comes with a 30 day, "No Questions Asked - 100% Money Back Guarantee". Please Note: The door bar attachment screws we provide are somewhat LARGE (1/2" diameter). In fact, they are on average about 2 times as large the screws many of our competitors provide. We use these large screws because they are approximately 4.5 times as strong as the competitor's 1/4" diameter screws.