Suitable for the following Ryobi single line models 

364-1, 
500, 500-1, 
700R, 700R-1, 
764R, 
840R, 
IDC364 

Suitable for the following Ryan single line string trimmers 

B260,
261, 262, 263, 263-3, 264, 264-1, 264-2, 264P,
265, 265-1, 265P,
Servistar 365

Suitable for the following Craftsman single line string trimmers 

79822,
79503

Contains 1 x Housing, 1 x Spool & Line, 1 x Spool Retaining Bolt, 1 x Spring 

Supplied with 5/16UNC x 1/2" right hand thread bolt