Andis Professional Animal Large Comb Set, 8 Pieces. Attachments snap on and off easily. To use, place the hooks of the metal clip on the attachment on to the base of the clipper blade. Then push the attachment comb up and over the teeth of the blade. To remove, reverse the process.8 piece kit for grooming versatility. Fits Andis blades size 40, 35, 30 and 10. Sizes #0, #1/4, #A, #B, #C, #D, #E, #F (5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/4")