Attachment clamps down into V-groove on pulley to distribute load; allows you to safely remove stubborn pulleys without damaging them Use with Grip-O-Matic pullers or Push-Pullers Maximum spread is 5-7/8 inches and the minimum spread is 1-3/4 inches Thread of tapped hole in adapter 5/8-18 Use with OTC puller numbers 1035, 1036, 1037, 1038, and 927