Dual Ring Piston Kit Honda CR125M Elsinore '73-78 / MT125 '74-78 TM-RACING-MX-125-2T-2004 What does Graded Size mean

What does Graded Size mean

K7015D100-2

K7015D050-2

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Dual Ring Piston Kit Honda CR125M Elsinore '73-78 / MT125 '74-78 TM-RACING-MX-125-2T-2004 What does Graded Size meanALL PISTON KITS INCLUDE PISTON, RINGS, WRIST PIN, AND RETAINING CLIPS UNLESS NOTED. REPLACEMENT COMPONENTS LISTED BELOW ITEM BORE SIZE PISTON SIZE RING RING QTY NEEDED CLIP WRIST PIN SE BEARING 8151DA 56. 00 55. 94 RSB5600 2 CW14 WP025 N1008 8151D050 56. 50 56. 44 RSB5650 2 8151D100 57. 00 56. 94 RSB5700 2 8151D150 57. 50 57. 44 RSB5750 2 8151D200 58. 00 57. 94 RSB5800 2 Click the component to view and add to your cart What does Graded Size mean?