IP casing top and bottom halves dowel pad weld relief grooves, form 6.1/4″ id x 6.7/8″ od (5/16″ wide) x 5/8″ dp groove with R5/32″ into 5.1/2″ id x 5″ to 8″ long bore x 12.1/2″ od pad with … holes …. BSW ? on … pcd