Stens 385-407 Heavy-Duty Twist Feed Head Ideal for consumer and commercial use Recommended for curved and straight shaft trimmers over 25cc; heavy-duty manual feed head with quick line indexing Spool holds 15-foot to 20-foot of .095-inches diameter line; eliminates line crossing on spool; housing design prevents knob wear; replaceable eyelets Uses .080-inches, .095-inches or .105-inches diameter line Arbor sizes included; 7milimeter by 1.00 LHM; 8milimeter by 1.25 LHM; 10milimeter by 1.00 LHF; 10milimeter by 1.25 LHF