The Assortment O-Ring set includes 800 Buna-N o-rings featuring a 70 Durometer hardness and a material thickness of 1/16". This collection covers inside dimensions ranging from 1/8" to 2-1/2" and outside dimensions from 1/4" to 2-5/8", with 25 pieces of each size. Ideal for fleet and automotive applications, these o-rings provide reliable sealing solutions in various environments. All components are conveniently organized in a sturdy 32-hole metal parts box for easy access and storage.