TINES DESIGNED W/ HEAT TREATED HOOK STYLE HEADS, ALSO W/INJECTION MOLDED PREMIUM NATURAL RUBBER. FOR HIGH QUALITY & LONG LIFEYOKE HEIGHT: 1-3/8''BOLT HOLE DIA: 5/16''TINE LENGTH BOTTOM OF YOKE: 7-1/4''TINE DIA.: 1/4''Vermeer: 503 I, 504 H, 504 I, 504 L, 554 XL, 604 J, 604 K, 5400, 5410, 5500MF: 645, 656, 1440, 1455, 1550, 1565