Brand: Allstar Performance Manufacturer's Part Number: ALL54180 Part Type: Electrical Switches Product Line: Allstar Performance Wide-Open Throttle Switches Automotive Fittings Part Number: AAF-ALL54180 UPC: 848238056372 Switch Actuation Style: Spring-loaded lever Circuit Activation: Momentary Pole: Single Lighted: No Safety Cover: No Labeled: No Weatherproof Sealed: No Wiring Included: No Relay Included: No Switch Material: Plastic Switch Finish: Gray Quantity: Sold individually. Notes: Includes mounting bracket for Holley 4150 style carburetors. Description: Allstar Performance wide-open throttle switches are designed to mount to the base of a Holley carburetor and activate when wide-open throttle is achieved. They're available with or without a mounting bracket. The brackets are made from lightweight billet aluminum that's been black anodized for protection. The brackets work with the standard secondary arm, as well as a throttle adjustment-screw secondary arm.