This O-Ring Assortment Set holds 407pcs SAE standard rubber o-rings and 419pcs metric universal standard rings for your plumbing, automotive, and general repair needs.
Metric standard have 32 sizes from 3 mm I.D. to 50 mm I.D.
SAE standards have 32 sizes from 1/8" I.D. x 1/4" O.D. to 2" I.D. x 2-1/4" O.D.
High quality rubber construction gives these o-rings oil and UV resistance,make rings with extra thick wall design provides long-term use.
Each type one comes in a heavy-duty plastic storage case that keeps each size separated and organized; Red box for SAE rings and Blue box for metric rings for you clarify easy.