Genuine OEM Husqvarna Chainsaw Chain Part 591101266. Fits: Husqvarna: 435 440 440E 445 450 545 Chainsaws. This Original Husqvarna H21 16" Chainsaw Chain is a high-performance low. Recommended for use on 35cc to 60cc chainsaws. Gauge: .058 Drive Links: 66 Length: 16" Pitch: .325"