Proxxon (23080) 36 Piece Socket Set with 1/4 inch Square Drive Ratchet made from one single piece for strength and quick release button releases socket instantly when pressed Ratchet has perfect teeth suitably hardened for maximum life expectancy Sockets and attachments made from highest quality steels and exceed DIN/ISO requirements for hardness and maximum torque Screwdriver tips made from chrome-silicon manganese-molybdenum steel Welded steel box with strong molded plastic insert for secure storage of set included