1、APPLICABLE MODEL: Oil drive pump worm gear kit is fit for 5200 4500 5800 52cc 45cc 58cc chainsaw oil drive pump. 2、SIMPLE REPLACEMENT: High quality replacement parts. Simple replacement can directly replace broken or old ones. 3、EASY TO INSTALL: Oil drive pump worm gear kit can be directly installed and used according to the applicable model. 4、HIGH QUALITY MATERIAL: Oil drive pump worm gear kit for 5800 is made of high quality iron and PC material not easy to damage. 5、LONG USE: Oil drive pump worm gear kit for 4500 features high hardness and high reliability proving a long use.