20" - CHAINSAW CHAIN .325" - 058" - 76 LINKS, SINGLE
PROFESSIONAL LOW KICKBACK CHAINSAW CHAIN 
Size: .325" 058" (1.5mm) 76 Links 

Suitable Replacement for Oregon 21
Fits the following makes & models;

Husqvarna
51, 55, 346XP, 350, 351, 353, 357XP, 359, 362XP, 450, 450 II, 450e, 450e II, 450 Rancher, 450 Rancher II, 455 Rancher, 455 Rancher II, 455e Rancher, 455e Rancher II, 545, 545 II, 550XP, 550XP II, 550XPG II, 555, 560XP, 560XPG

Hyundai (see note)
HTRT65-2C, HYC5620, HYC6200X, HYC6220, P6220C
Note! Hyundai model HYC5620 also uses 78 links
 
Titan (see note)
TTL760CHN
Note! Titan model TTL760CHN also uses 78 links
 
Non-Genuine Part
Oem No.21BPX076E, 3638 000 0076