Item Dimensions LxWxH 5.25 x 3 x 1 inches Frame Material Stainless,Steel About this item Compatible Instep Bike Trailer Adapter: Our 2- pack bicycle trailer hitch pin is designed for a wide range of bicycle carriers, trailer sizes, models & styles This bicycle trailer attachment comes with flat coupler, washer, & locking pin for a quick & easy installation. For Series: AA, AB, AC, AD, AE Wide Compatibility: This bike trailer bracket as a flat coupler acts as a stabilizer and woks on a variety of hitches. This quick hitch adapter bracket is compatible with Instep and Schwinn trailers. Designed to replace Part 25-SA074. For Models made before 02/11/2016 Built To Last: Our trailer coupler pin is made of black, power coated stainless steel which is strong, durable, & won't rust or corrode when placed outside for longer periods. Our bike trailer attachment gives you the peace of mind your child will be safe Easy & Convenient: This child bike trailer is quick and easy to install for your dog or kid, making it more convenient when you're out and saves your time and energy. Our bike hitch trailer makes it a breeze to get the family out on a bike ride Have a great time shopping!