Extends the cutting length of metal and ceramic blades. For use with andis detachable clippers and most other brands. Works best with blade sizes 40, 35, 30 and 10. Contains Sizes #7, 1/16 , 1.5 Mm; #6, 1/8 , 3 Mm; #5, 3/16 , 5mm; #4, 1/4 , 6 Mm; #3, 5/16 , 8 Mm; #2, 3/8 , 10 Mm; # 1 1/2, 7/16 , 11 Mm; #1, 1/2 , 13 Mm; #1/2, 9/16 , 14 Mm. Ultra Break Resistant Plastic With Chrome Steel Mechanism. 9 PIECE BLUE