Chain sprocket/nut assembly 1/4"P 8 d. For models: MS 201, MS 201 T, MS 201 TC-E, MS 201 TC-M. Includes: Picco nut 1/4" 8 d code: STH/11296407102 Chain sprocket 1/4" 8d code: STH/11456402011 Stop bar code: STH/11458935900