This listing is for THREE Tappet Lifter Block Guide Alignment Tools. Function: The tappet guide alignment tool set is used to perfectly align the oil hole from the crankcase to the tappet block. These tools are compatible with Harley Davidson Big Twins from 1977 to 1990. They can also be used to center the oil pump on the Harley Davidson Twin Cam Engines from 1999 to Present. The threads on the tool are 1/4" - 20TPI. Replaces Harley Davidson Part Number # 33443. Material: made of high-quality cold rolled steel, which is sturdy and durable. These tappet guide alignment tools are professionally made in the United States on the state of the art CNC equipment with 100% quality inspection. Tools come with black oxide finish preventing corrosion to assure many years of service. Package Includes: 3 x Tappet Guide Block Alignment Tools (as shown on the picture). We offer combined shipping services. All our tools are made from high quality materials and are designed for long life durability and ease of use.