Lash wrenches are two-part steel tool that makes it easy to accurately adjust your 9/16" or 5/8" rocker nuts, Timing light features a super bright xenon flash, and a high Vis LED display, Universal filter cutter works on filters 1-1/2" to 6-1/8" in diameter, Compression kit includes heavy-duty 2 3/4" gauge with 10" whip hose-gauge, rubber boot and various sizes of hose and adapters, Professional set initial and advance timing to obtain total timing and peak performance.