OTC (679 V-Belt Pulley Pulling Attachment Attachment clamps down into V-groove to distribute load 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 inch-18 Use with puller numbers 1035, 1036, 1037, 1038, and 927