5 Pack Quick Change Tool Post Holder OXA 250-004 Heavy Duty. Heavy duty 5 pack quick change tool post holders for efficient boring bar setups. Includes five durable tool post holders for quick changes. Designed for boring bar tool post applications. Heavy duty construction ensures long-lasting performance. Compatible with OXA 250-004 model tool posts. Compatibility may vary depending on the machine’s serial number. Keywords: quick change tool post holder pack, boring bar tool post holder, OXA 250-004 tool post, heavy duty tool post holder, aftermarket tool post holder, tool post holder for boring bars, 5 pack tool post holders. Listing and template services provided by inkFrog.