The Lone Wolf 3.5 lb Connector is an improved version of the Glock original 3.5. Special features include: 25% reduction in side thickness provides superior reset action, completely pre polished for the smoothest trigger pull, Nickel plated for corrosion resistance. Precision target shooters and Law Enforcement personnel demand excellence in trigger performance. Now you can tune your trigger to perform its best! This drop in part is easily installed or removed and will instantly provide a lighter crisper trigger pull. Fits all Glock models.