Morgan BS-16 Heavy Duty Nokker Attachment Kit - Designed to fit all our heavy duty 9-lb. Slide Hammers. Heat treated alloy steel round hooks for those places the wider attachments won't go. Hooks have 1/2-13 thread. Adapter body has 1/2-13 and 3/4 NPT female threads. Comes with BS-16S Small Hook, BS-16L Large Hook, Adapter, and Nut.