Are you asking what size latch you would need for your boat?

Keep in mind when measuring the bow roller width, the Drotto Boat latch has to fit inside the same bracket as your roller. Since there are two Drotto Boat Latch sizes it is important to measure the inside width of the bracket before ordering.

Brackets that measure 3 1/2″ to 4″ – Of the 2 Drotto Boat latch sizes we offer, you will need the Large Drotto Boat Latch. (add spacers to brackets larger than 3 3/4″ to create a snug fit (spacers/washers not included in purchase)) CLICK HERE FOR LARGE MODEL

Brackets that measure 3″ to 3 3/8″ – Of the 2 Drotto Boat latch sizes we offer, you will need the Small Drotto Boat Latch. (add spacers or washers if bracket width is larger than 3″ to create a snug fit (spacers/washers not included in purchase)) CLICK HERE FOR SMALL MODEL
***If you own a Ranger, Stratos or a boat that is very nose heavy, please refer to our Ranger Stratos model HERE. Boats that are nose heavy. or if you launch from steep landings – The front nose of the boat tends to drop when launching. If the front nose drops it will catch on our Drotto boat latch. We have added a roller accessory to the face of the Drotto boat latch in order to prevent this from happening. This will create a much smoother launch.

The Drotto boat latch sizes. The 3” Drotto boat latch and the 3 ¾” Drotto boat latch, but what does this mean? Not all trailers and rollers are the same size, but there are two common sizes of bow roller bracket widths, 3” and 3 ¾”. We have designed and patented 2 sizes of the Drotto automatic boat latch in order to fit many more types and sizes of boats and trailers.