This is a Losi 5-40x20mm Left Hand Thread Button Head Screw Set, and is intended for use with the Losi 8IGHT family of 1/8 buggies, and the Losi L8IGHT Model vehicles.  Features: Screw for suspension arm to shock mounting Left Hand Threaded Screw eliminates the bottom shock screw from backing out during long runs Only needed to be used on the left rear and right front suspension arms Black Oxide for easy identification Designed for use with 8IGHT Buggies Part Compatibility: Losi 8IGHT 2.0 Losi L8ight Losi 8IGHT-E 2.0 Losi 8IGHT 3.0 Losi 8IGHT-E 3.0