Chain Saw Chain Fits Saws With A 45cm (17-18") Bar And Chain With 60 Drive Links*. PRO38ccCSA, PRO42ccCSA *This chain is - TYPE 2 The length is determined by the number of DRIVE LINKS (see below) this number is shown in the product description above. *We offer three types of chainsaw chain, each available in a number of different lengths to fit most chainsaws from ALL manufacturers. The three types of chain are shown below, BEFORE YOU ORDER! - please count your drive links and compare your old chain with the image below to determine whether your chain type matches product decription, TYPE 1, TYPE 2, or TYPE 3