Feature●High Quality: Made of Nitrile (NBR) 90 shore material,are durable,high temperature resistance,anti static,oil resistant,UV resistance,heat resistant,wear resistant.●Multi size: This handy kit contains 396pcs NBR o-rings in the 36 most popular sizes used on Caterpillar equipment.●Wide Application: O-ring kit use for Caterpillar excavator.●Handy Packing: Comes with a heavy duty storage case that keeps each size o rings separated and organized,that makes more convenient to carry, select and collect.●Customer Service: You are unhappy for any reason, return your kit with no questions asked and BUSY-CORNER will provide a full refund.Description