Features: The rocker arm shafts have a in them that the bolt is supposed to butt up against, locking the rocker arm shafts in place. However, the bolt hole is too large, leaving a . This allows the shaft to rotate and hit the bolt, causing a tick. 1. The Rocker Lockers eliminate the , locking the shaft from turning and striking the bolt, eliminating that annoying tick. 2. The Rocker Lockers also center the inner rocker cover so that it is always located in the same position eliminating different wear patterns on the rocker arm/valve and a better alignment of the pushrod in the holes. 3. The Rocker Lockers are tapered so that they lock themselves in and wedge the bolt/shaft in place. It is recommended to replace the rocker base gaskets. This is the gasket that goes between the Rocker Cover Inner & the head on each cylinder. Note: If you ever need to remove the lockers, just use a punch and tap them out, they are usually reusable. Item Type: Crankshafts Displacement (ml): Rocker shaft locking kit No. of Cylinders: 1 Cylinder Model Name: Intake Manifold A: Motorcycle Parts B: car accessories C: auto accessorie Color: Silver+Brass color material: metal Package Contents: 4 * Brass Precision Tapered Bushings 2 * O-Rings 1 set * mounting accessories Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.