Narrow Wide Serrated Oval Plate for Shimano XTR FCM9000 and FCM9020 cranks with 96BCD asymmetrical Valid for 1x10 single plate transmissions; 1x11 and 1x12 Patented plate with Wolf Tooth Drop-Stop technology prevents chain outlets Made from CNC Alu 7075-T5 Chain line 49mm from 30 to 34 teeth. 10th Oval Weight: 50 grams