4-Pack flat bicycle trailer hitch pin kit including flat coupler, washer, and locking pin for quick installation Compatibility and fit - Designed to fit a wide range of bicycle carriers, trailer sizes, models, and styles - Compatible with Instep and Schwinn trailers - Replaces Part #25-SA074 - For Series AA, AB, AC, AD, AE - For models made before 11/02/2016 Durable construction - Black powder-coated stainless steel for strength and durability - Resistant to rust and corrosion when exposed to outdoor conditions - Built to last, helping keep your child safe during rides Easy and convenient - Quick and easy to install on compatible trailers - Suitable for kid trailers and dog trailers; saves time and effort on outings - Provides a secure, trustworthy hitch connection Use scenarios - Family bike rides with kids using Instep/Schwinn trailers - Transporting a pet in a compatible trailer - Replacing a worn or lost hitch pin on compatible Instep/Schwinn setups Quality assurance - 100% quality guarantee - 100% customer support - 6-month product warranty