BBR Tuning 2-Stroke Motorized Bicycle Engine 20 Piece Heavy Duty Engine Hex Stud Set &ndash; Gas Bike Allen Bolt Upgrade NO MORE STIPPED SCREWS: The BBR Tuning Twenty Piece Stud Set replaces all the phillips screws and studs that are prone to stripping and braking on your two stroke bike engine with heavy duty hex studs. These bolts will allow you to properly tighten them without wearing out or getting stuck in your engine. COMPLETE KIT: Full 20 piece kit- most kits on the market are 12-16 bolts only. Complete bolt kit INCLUDING motor studs EASY INSTALLATION: Installation is a breeze, just replace each bolt and stud with the correct one supplied in your new BBR Tuning Heavy Duty Stud Set UNIVERSAL FIT: These bolts are designed to work with most standard 48cc, 60cc, 66cc and 80cc two stroke motorized bicycle engine kits PACKAGE INCLUDES: 4x Motor Head Studs w/ washers & lock washers, 4x Motor Mount Studs (2x rear, 2x front) w/ nuts, washers, and lock washers, 3x Drive Sprocket Case Screws, 5x Gear Case Cover Screws, 4x Magneto Case Cover Screw