ONE COMBO KIT FOR ALL YOUR NEEDS: 7-Piece set includes square drive adapters: 1/4"(F) to 3/8"(M) - 3/8"(F) to 1/4"(M) - 3/8"(F) to 1/2"(M) - 1/2"(F) to 3/8"(M) & 1/4" HEX to 3 square drive sizes: 1/4" Sq. 3/8" Sq. 1/2" Sq. Adapt & Convert your Impact Driver or Power Drill for any application. HEAVY DUTY – Your Impact Grade Adapters are Hardened, Heat-treated & precisely machined to withstand the test of time. Engineered from Chromium stirred with Molybdenum and/or Vanadium. GET A BIGGER BANG FOR YOUR BUCK: While other socket reducers are vulnerable to rust and corrosion, our adapters are treated with a rust-proof Manganese Phosphate coating to provide active protection. REDUCE FATIGUE & DISCOMFORT: the smart spring-pressured detent ball system will prevent dropping while the through-hole in the drive end will securely lock the adapter onto the drive tang for unhinged execution. 100% PROBLEM-SOLVING, 100% RISK-FREE – Meets & Exceeds ANSI (The American National Standard Institute) and is backed by our Lifetime Limited Warranty for your complete peace of mind.