Combi Systems allow for the use of one engine unit to power many different tools. Take a look at these.  Click on the combi system and all the attachments for that machine will follow below. P P Estates stocks Stihl Kombi systems and the Echo machine, both offer the user high leves of durability and reliability. These machines are becoing more popular with contractors as the can be split down and secured easier against theft. It has now been proven that there is no quality difference between these split shaft machines and their ridgid shaft equivalents.